Which gut bacteria are responsible for weight loss, and how can we manipulate the gut microbiome to promote weight loss? In this article, we will explore the latest research on the role of gut bacteria in weight loss.

1. The Microbiome and How It Affects Weight

The microbiome has been shown to play a role in weight regulation. The gut microbiome can affect weight through its ability to extract energy from food, release hormones that affect appetite and metabolism, and alter the way the body absorbs and uses nutrients.

Studies have shown that when the gut microbiome is disrupted, it can lead to weight gain. Conversely, when the gut microbiome is healthy, it can lead to weight loss. Ways to improve the gut microbiome include eating probiotic-rich foods, consuming prebiotics, and practicing good hygiene.

2. Gut Bacteria and Weight Loss

There is a lot of buzz about the gut microbiome and its role in weight loss. Could the trillions of bacteria living in our guts be the key to shedding pounds? It’s definitely a possibility, and scientists are starting to take a closer look at the microbiome-gut-weight connection.

So far, it seems that gut bacteria may play a role in weight gain and obesity. For example, when scientists transplanted gut bacteria from obese mice into lean mice, the lean mice became obese. This suggests that the type of gut bacteria you have may affect your weight.

Interestingly, certain types of gut bacteria seem to be associated with decreased weight gain and obesity. One such type is called Ruminococcus obeum. When scientists put this type of bacteria into mice, the mice became leaner and had lower blood sugar levels.

3. Best Gut Bacteria for Weight Loss

When it comes to weight loss, there are many things you can do to help promote success. But what if the key to weight loss was as simple as taking a probiotic supplement?

Recent studies have shown that gut bacteria may be linked with weight loss and obesity. One study found that obese people had different gut bacteria than people who were normal weight or overweight. Another study showed that when overweight people took a probiotic supplement, they lost more weight and body fat than those who didn’t take the probiotic.

So, what are the best gut bacteria for weight loss? The answer may not be entirely clear yet, but some of the best probiotics for weight loss include Lactobacillus acidophilus, Bifidobacterium lactis, and Bacillus coagulans.

Lactobacillus Acidophilus and Weight Loss

Lactobacillus acidophilus is a probiotic bacteria found in yogurt and other fermented foods. It has been shown to have a variety of health benefits, including weight loss.

One study showed that overweight women who took Lactobacillus acidophilus for eight weeks lost more weight and body fat than those who didn’t take the probiotic.

Another study showed that obese men who took Lactobacillus acidophilus for eight weeks lost more weight and body fat than those who didn’t take the probiotic.

The researchers believe that this is because Lactobacillus acidophilus helps to improve gut health, which in turn helps to promote weight loss.

Bifidobacterium Lactis and Weight Loss

There is some evidence that the probiotic bacteria Bifidobacterium lactis may help with weight loss. One study found that people who took a supplement containing B. lactis lost more weight and body fat than those who didn’t take the supplement.

Another study found that obese women who took a B. lactis supplement for eight weeks lost more weight and body fat than those who didn’t take the supplement.

It’s not clear why B. lactis seems to help with weight loss, but it’s possible that it alters the gut bacteria in a way that promotes weight loss. More research is needed to know for sure if B. lactis can help with weight loss.

Bacillus Coagulans and Weight loss

Bacillus coagulans is a probiotic bacterium that helps improve digestive health. Recent studies have shown that Bacillus coagulans may also help with weight loss.

One study found that obese participants who took Bacillus coagulans for eight weeks lost more weight and body fat than those who didn’t take the probiotic.

Another study showed that Bacillus coagulans helped reduce inflammation and improve insulin resistance in people with type 2 diabetes.

These findings suggest that Bacillus coagulans may be beneficial for weight loss and improving metabolic health.

4. The Benefits of Having the Right Gut Bacteria for Weight Loss

If you’re looking to lose weight, you might want to focus on your gut bacteria. That’s because having the right mix of bacteria in your gut may help with weight loss.

Studies have shown that obese people tend to have different gut bacteria than people who are a healthy weight. And when obese people lose weight, their gut bacteria changes too. This suggests that having the right gut bacteria may be important for weight loss.

So how do you promote the growth of good gut bacteria? One way is by eating probiotic foods and supplements. Probiotics are “good” bacteria that help keep your gut healthy. You can find probiotics in fermented foods like yogurt, kefir, and sauerkraut, as well as in supplements.

5. How to Get the Right Gut Bacteria for Weight Loss

When it comes to weight loss, there are a lot of things that go into it from what you eat, to how much you move. But one important factor that is often overlooked is the role your gut bacteria play in weight loss.

Gut bacteria can help or hinder weight loss, depending on the type of bacteria you have. So if you’re looking to lose weight, it’s important to get the right gut bacteria.

How can you do that? There are a few things you can do. First, eat plenty of probiotic-rich foods. Probiotics are good for your gut bacteria and can help to increase the number of healthy bacteria in your gut.

Fermented foods like yogurt, kefir, and sauerkraut are all great sources of probiotics.

6. Frequently Asked Questions (FAQs)

Can Gut Bacteria Cause Weight Gain?

There is a lot of talk about gut bacteria and how it can affect weight, but does this actually mean that gut bacteria can cause weight gain? The answer is not clear-cut, but there is some evidence to suggest that gut bacteria may play a role in weight gain.

One study looked at the gut bacteria of obese and thin people and found that obese people had different gut bacteria than thin people. This suggests that gut bacteria may be involved in weight gain. However, more research is needed to determine whether or not gut bacteria actually cause weight gain.

There are several ways that gut bacteria could potentially contribute to weight gain. For example, certain types of gut bacteria may produce substances that promote fat storage or make it harder to lose weight. Gut bacteria may also affect appetite or how efficiently the body burns calories.

Does Gut Health Affect Weight Loss?

There is a lot of talk about gut health and how it affects weight loss. Some people say that if your gut isn’t healthy, you won’t be able to lose weight. Others say that the gut has nothing to do with weight loss. So, who is right?

The truth is that gut health does affect weight loss, but not in the way that most people think. The gut doesn’t control how much weight you lose, it controls how well you lose weight.

If your gut isn’t healthy, you won’t be able to lose weight as easily or as quickly as someone whose gut is healthy.

That’s because the gut is responsible for digesting food and absorbing nutrients. If your gut isn’t healthy, it won’t be able to do its job properly.

Does Gut Bacteria Affect Weight?

There is a lot of talk about gut bacteria and how it affects weight, but does it really have an impact? According to some experts, gut bacteria do play a role in weight.

Gut bacteria help to break down food and extract energy from it. When there is an imbalance in the gut bacteria, it can lead to weight gain.

One way to help keep your gut bacteria in balance is to eat probiotics. Probiotics are foods or supplements that contain good bacteria. Eating probiotics can help improve digestion and help keep your gut bacteria in balance.

Another way to help your gut bacteria is to eat plenty of fiber. Fiber helps feed the good bacteria in your gut and keeps you regular. Eating a fiber-rich diet can also help you lose weight and maintain a healthy weight.

Can Bad Gut Bacteria Cause Weight Gain?

There is a lot of talk about gut health in the wellness world. It seems like every other day there’s a new study touting the benefits of eating fermented foods, investing in a high-quality probiotic, or swearing off gluten altogether.

But what if you’re doing everything “right” and your gut health is still less than ideal? Could it be that an underlying gut issue is causing your weight gain—even if you don’t have any obvious digestive problems?

The answer is yes. Believe it or not, bad gut bacteria can actually cause weight gain. How? By disrupting your hormones and affecting your metabolism.

In fact, recent studies have shown that unhealthy gut flora can lead to increased levels of leptin (a hormone that signals satiety) and decreased levels of ghrelin (a hormone that stimulates hunger).

Can I Change My Gut Bacteria to Lose Weight?

There is some evidence that suggests that you can change your gut bacteria to lose weight. One study showed that people who lost weight were able to keep the weight off after they began taking a probiotic supplement.

The probiotics helped to increase the number of bacteria that promoted weight loss. However, more research is needed to determine whether or not changing your gut bacteria can help you lose weight.

Conclusion

It seems that certain gut bacteria may be responsible for weight loss. However, more research is needed to determine which gut bacteria are associated with weight loss and how they contribute to this process.

Additionally, it is important to note that not all gut bacteria are beneficial, and some may even be harmful. Therefore, it is important to consult a healthcare professional before making any changes to your diet or taking any supplements containing gut bacteria.

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• Cellulitis
• Pertussis
• Tuberculosis
• Pneumonia
• Impetigo
• Tetanus
• Chlamydia
• Meningitis
• Lyme Disease
• Otitis Media
• Erysipelas
• Botulism
• Boil
• Necrotising Fasciitis
• Staphylococcal Infections
• Carbuncle

1. What Are Bacteria?

Bacteria are unicellular microorganisms, and therefore, cannot be seen by the naked eye [2]. They are also known as prokaryotes and are found everywhere around us, including water, air, and soil.

They also inhabit the surface of the skin and are an important part of the gastrointestinal system.

Although bacteria can cause severe and tissue-damaging infections, not all bacteria are bad.

The best example of good bacteria is the microbiota or gut flora (microbiome) that are essential for the breakdown of food during digestion which provides essential nutrients for the body.

1.1. What Are the Types of Bacteria?

Bacteria are classified according to their shape, composition of their cell wall, mode of their nutrition, and their mode of respiration.

• Classification based on shape

Bacteria are classified as rod-shaped or bacillus (e.g., Escherichia Coli), sphere or coccus (e.g., streptococcus pneumoniae), spiral or spirilla (spirochete) such as Spirillum volutans, and comma-shaped or vibrio (e.g., Vibrio cholerae).

• Classification based on the composition of the cell wall

Bacteria are classified as Gram-positive (Peptidoglycan cell wall) and Gram-negative (Lipopolysaccharide cell wall).

• Classification based on nutrition mode

Autotrophic bacteria (Cyanobacteria) and heterotrophic bacteria (All disease-causing bacteria).

Autotrophic bacteria are bacteria that make their own food, while heterotrophic bacteria cannot make their own food and require food from their environment.

• Classification based on respiration mode

Bacteria are classified as aerobic which requires oxygen for survival (e.g., Mycobacterium), and anaerobic bacteria which do not require oxygen (e.g., Actinomyces).

1.2. How Does Bacteria Reproduce?

Each bacterium (single of bacteria) divides into two bacteria through a division process known as binary fission.

This process of multiplication is controlled by many factors including temperature and availability of nutrients (food).

2. Cellulitis

Cellulitis is a bacterial infection of the dermis and hypodermis layers of the skin by the bacteria streptococcus and Staphylococcus aureus.

Cellulitis manifests with localized pain, redness, and heat with potential complications such as abscess, inflammation of surrounding tissues, and sepsis.

The treatment of cellulitis involves antibiotics such as amoxicillin, cephalexin, or cloxacillin.

2. Pertussis

Pertussis or whooping cough is a bacterial infection of the lung and respiratory tubes by the bacteria Bordetella pertussis.

It manifests with symptoms such as runny nose, fever, vomiting, extreme fatigue, and coughing which become severe after weeks.

Although vaccines exist for this pertussis, antibiotics such as erythromycin, azithromycin, or clarithromycin are used for treatment.

3. Tuberculosis

Tuberculosis (TB) is a bacterial infection that mainly targets the lung (pulmonary tuberculosis) but can also affect another part of the body such as the neck, urogenital system, and central nervous system.

It is caused by Mycobacterium tuberculosis and manifests with symptoms such as fatigue, fever, sweating, chills, loss of appetite, chest pain.

Although vaccines exist for tuberculosis, treatment with multiple antibiotics is used for patients.

4. Pneumonia

Pneumonia is an infection of the alveoli of the lung by Streptococcus pneumoniae causing chest inflammation.

Alveoli are small air sacs found at the end of pulmonary airways and involved in gas exchange by providing oxygen to the blood and collecting carbon dioxide from the blood.

Bacterial infection is not the only cause of pneumonia as it can also be caused by viral infection.

Pneumonia manifests with symptoms such as fever, dry coughing, chest pain, difficulty breathing.

If the pneumonia is caused by a bacterial infection, antibiotics are used for treatment.

5. Impetigo

Impetigo is a bacterial infection of the skin dermis by Staphylococcus aureus or Streptococcus pyogenes.

Impetigo manifests with yellowish crusts on the face, arms, legs, and between the waist and neck. The lesions may be itchy and painful.

The treatment of impetigo involves topical (skin) application of antibiotics such as mupirocin.

6. Tetanus

Tetanus is an acute bacterial infection of the nervous system by Clostridium tetani found in soil, manure, dust, and saliva.

The most common symptoms are severe spasms, headache, fever, difficulty swallowing, tachycardia, and hypertension.

Spasms are caused by the effect of Clostridium tetani toxins on muscle contraction.

Although vaccines exist for tetanus, treatment involves tetanus antibodies to inactivate the toxins and antibiotics to target Clostridium tetani

7. Chlamydia

Chlamydia is a common sexually transmitted bacterial infection caused by Chlamydia trachomatis. Transmission can also happen during childbirth.

It manifests with urogenital symptoms such as vaginal discharge, penis discharge, and burning feeling when urinating.

If untreated it can lead to complications such as infertility, pelvic inflammation, or ectopic pregnancy.

Chlamydia is treated using antibiotics such as doxycycline or erythromycin.

8. Meningitis

Meningitis is the infection of the membranes covering the brain and spinal cord, known as meninges, causing inflammation.

Meningitis is mostly viral but can be bacterial caused by meningococcal bacteria such as Neisseria meningitis, pneumococcal bacteria such as Pneumococcus pneumoniae, Hemophilus influenzae type b (HIB) bacteria.

Meningitis caused by Listeria monocytogenes can be due to the consumption of foods that are not properly prepared.

Meningitis manifests with symptoms such as headache, fever, stiffness of the neck, vomiting, confusion, joint and muscle pain, seizures, feeling sleepy, and skin rash.

The treatment of bacterial meningitis involves antibiotics and corticosteroids.

9. Lyme Disease

Lyme disease is a bacterial infection caused by Borrelia burgdorferi which is transmitted to humans by infected ticks.

It manifests with redness of the site of the bite, headache, fever, and tiredness. Complications may include facial nerve paralysis and joint pain.

Although vaccines exist for Lyme disease, the treatment involves antibiotics such as doxycycline.

10. Otitis Media

Otitis media is an inflammation of the middle ear caused by a viral or bacterial infection with Staphylococcus aureus, Streptococcus pneumoniae, Hemophilus influenzae, or Moraxella catarrhalis [3].

It manifests with symptoms such as fever, ear pain, and loss of hearing.

The treatment of otitis media caused by bacterial infections involves antibiotics and pain relievers.

11. Erysipelas

Erysipelas is a bacterial infection of the skin upper dermis by Streptococcus pyogenes causing skin rash on the face and legs.

Erysipelas can also manifest with fever, fatigue, headaches, vomiting, and shivering.

The treatment also involves antibiotics such as erythromycin or penicillin.

12. Botulism

Botulism is a rare bacterial infection that affects the neurotransmission of acetylcholine by toxins produced by Clostridium botulinum.

Symptoms include muscle weakness, blurred vision, double vision, speech difficulty, difficulty swallowing, and breathing difficulties. If intreated respiratory failure may occur.

Treatment involves the use of botulinum antitoxin and intensive care to restore vital functions.

13. Boil

Boil or furuncle is a bacterial infection of the hair follicle by Staphylococcus aureus leading to hard and painful lumps on the skin that can develop an abscess.

Most of the time a boil goes away on its own and rarely leads to complications.

14. Necrotising Fasciitis

Necrotizing fasciitis or flesh-eating disease is a bacterial infection of the under skin soft tissue that surrounds organs and muscle by a mixture of bacteria such as gram-positive bacteria, gram-negative bacteria, clostridium bacteria, and Bacteroides.

It mostly develops from cuts or burns that affect the arms, legs, and perineum resulting in swelling, redness, intense pain, fever, diarrhea and vomiting, and dark blisters.

Treatments of Necrotising fasciitis involve surgery to remove the dead tissue or amputation and several antibiotics due to the different types of bacteria involved.

15. Carbuncle

Carbuncle is a bacterial infection of the back of the neck skin by Staphylococcus aureus or Streptococcus pyogenes resulting in a cluster of boils that causes fever and chills.

A carbuncle can lead to complications such as sepsis, osteomyelitis, and endocarditis.

16. Staphylococcal Infections

Staphylococcus infections are due to staphylococcus bacteria that can take advantage of cuts and bruises on the skin to invade different tissues and organs in the body.

Staphylococcus bacteria can cause skin diseases, asthma, rhinitis (nose tissue inflammation), sinusitis, gastroenteritis, sepsis, endocarditis (inflammation of the endocardium), and toxic shock syndrome.

Treatment of staphylococcal infections involves antibiotics and wound cleaning depending on the tissue or organ affected.

Conclusion

Although bacterial infections are efficiently treated with antibiotics, bacteria resistance to antibiotics is becoming an issue in the treatment of infections, and therefore, new anti-bacteria therapeutic agents are required to overcome this serious health problem.

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• Multiple Sclerosis (MS)
• Neuromyelitis Optica Spectrum Disease (NMOSD)
• Myelin Oligodendrocyte Glycoprotein (MOG)-Antibody Associated Disease
• NMDAR Encephalitis

1- What Is an Autoimmune Disease?

An autoimmune disease is when the body develops an abnormal immune response against certain parts of the body leading to their destruction.

An abnormal autoimmune response is associated with the production of antibodies against compounds (antigens) that belongs to the body, and therefore, that should not be recognized as foreign.

2- What is an Antibody?

Antibodies or immunoglobulins (Ig) are Y-shaped proteins produced by specific types of white blood cells known as lymphocytes B cells in response to pathogens such as bacteria and viruses.

An antibody recognizes and binds a specific antigen on the surface of a bacteria or virus leading to their destruction. It is highly specific and targets a specific antigen, and therefore, cannot target other antigens.

However, when there are abnormalities in the immune response, the antibodies start recognizing antigens on the surface of normal cells which leads to their destruction and the development of autoimmune diseases, including autoimmune diseases of the central nervous system [1].

3- What Causes Autoimmune Diseases?

• Genetic Susceptibility

Although the potential involvement of heredity in autoimmune diseases is unknown, studies of homozygotic twins (identical twins) and heterozygotic twins (non-identical twins) with multiple sclerosis (MS) and myasthenia gravis found an association between genetic factors and autoimmune diseases [2] [3].

• Infections

In multiple sclerosis (MS) and MOG-antibody associated disease, chronic infection with Epstein-Barr virus (EBV) and cytomegalovirus (CMV) were suggested as triggers of autoimmune response by mimicking the host (infected individual) normal antigens [4][5].

• Vitamin D Deficiency

Vitamin D is an antioxidant that has also a role as a modulator of immune response by controlling the proliferation (multiplication) of lymphocytes B cells and their production of antibodies.

Although the results are conflicting and require further investigations, studies reported an association between the incidence and susceptibility to multiple sclerosis (MS) and the decrease in the levels of vitamin D [6][7][8][9].

• Gut Flora Unbalance (Dysbiosis)

The gut flora or microbiota is a heterogeneous population of micro-organisms that includes bacteria, fungi, and archaea, and that plays an important role in the digestion and absorbance of food. 

During the process of aging, the function of beneficial microbes, that provide necessary nutrients for the body tissues, is severely affected, while harmful microbes, that contribute to the process, such as chronic inflammation and cancer, flourish.

Studies showed that fecal transplants from patients with multiple sclerosis (MS) into germ-free mice results in a higher incidence or severity of multiple sclerosis in these mice [10][11].

• Tumors

Tumors are characterized by an uncontrolled division of cells due to cancerous mutations in normal cells. When some tumors die, they can release both cancerous and normal antigens that are thought to initiate an autoimmune response [12][13].

4- Autoimmune Diseases of the Central Nervous System

• Multiple Sclerosis

The axons of neurons are covered by a sheath of a fatty acid (lipid), known as myelin, which insulates them and increases the rate of nerve impulses.

In multiple sclerosis (MS), the myelin sheath is damaged through a process called demyelination which disrupts the capacity of the affected neurons to conduct nerve impulses.

It is proposed that multiple sclerosis (MS) is due to a mix between genetics and infections; however, there is no evidence yet to support these hypotheses.

This demyelination of neurons results in the following symptoms:

Effects on the Central Nervous System: Cognitive impairment, anxiety, depression, mood instability, and fatigue.

Effects on the Vision: Inflammation of the optic nerve (Optic neuritis), involuntary eye movement (Nystagmus), perception of two images when looking a single object (diplopia).

Effects on the Musculoskeletal system: Fatigue, spasms, and Ataxia (uncoordinated movements).

Effects on Speech: slurred or slow speech due to a weakness of speech muscles (Dysarthria).

Effects on the Throat: difficulty swallowing (Dysphagia).

Effects on Sensation: Pain, paraesthesia, hypoesthesia.

Effects on the Bowel: Diarrhea or constipation and incontinence.

Effects on the Urinary System: frequent urination or retention of urine.

• Neuromyelitis Optica Spectrum Disease (NMOSD)

NMO is an autoimmune disease affecting the optic nerves, spinal cord, and brainstem. It is associated with autoantibodies targeting an abundant protein in the nervous system known as aquaporin 4 [14].

The causes of NMOSD are unknown and the symptoms are associated with a loss of vision, loss of sensation, weakness, and anomalies in the bladder function.

• Myelin Oligodendrocyte Glycoprotein (MOG)-Antibody Associated Disease

MOG-Antibody Associated Disease is a rare autoimmune disease affecting a protein known as myelin oligodendrocyte glycoprotein (MOG).

MOG is found on the myelin sheaths and produced by a type of neuronal cells called oligodendrocytes. In this disease, autoantibodies are produced against MOG which causes the damage of myelin causing the demyelination of the neurons.

The symptoms of MOG include pain, muscle weakness or paralysis, abnormal sensations, bowel such as Diarrhea or constipation, and anomalies of bladder function.

• NMDAR Encephalitis

NMDAR Encephalitis or anti-receptor encephalitis is an inflammation of the brain that is caused by autoantibodies against a receptor of the neurotransmitter glutamate known as NMDAR [15].

NMDAR is found on neurons where it plays an important role in the control of synaptic plasticity.

NMDAR Encephalitis is mainly caused by ovarian teratoma and by an inflammation of the brain associated with a herpes virus infection.

The symptoms of NMDAR Encephalitis include seizures, depression, mania, visual or hearing hallucinations, acute schizophrenic disorder, and cognitive and movement disorders.

5- How are CNS Autoimmune Diseases Diagnosed?

In addition to the symptoms associated with each CNS autoimmune disease, the patients are tested using magnetic resonance imaging (MRI), electroencephalogram (EEG), computerized tomography (CT) scan, and FDG-positron emission tomography (PET)/CT scan, to detect neuronal lesions [1].

Autoantibody testing is used to detect the presence of autoantibodies against proteins such as NMDAR, MOG, and aquaporin 4 in the serum and cerebrospinal fluid (CSF) using laboratory techniques such as immunohistochemistry, indirect immunofluorescence, western blot, and cell-based assays.

Conclusion

CNS autoimmune diseases are due to the generation of antibodies by lymphocytes B that attack specific proteins that are expressed on neurons and in the brain. Most therapies aim at eliminating the autoantibodies using plasma exchange and immunosuppression [1].

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This accumulation results in loss of neurons in the hippocampus and cerebral cortex, leading to progressive cognitive decline such as memory defects.

A connection between the brain and the gastrointestinal tract has been suggested due to the significant influence of the gastrointestinal flora (microbiome or microbiota) over the brain-gut axis [1] [2].

1. What Is the Role of Gut Flora in Alzheimer’s Disease?

The gastrointestinal tract is full of harmless bacteria that positively affect our health and contribute to our body’s natural processes. However, unbalance of the gut flora (Dysbiosis) can lead to significant pathological changes that can affect our immune system and brain functions.

This unbalance is due to several reasons such as a dietary change, accidental chemical consumption (unwashed pesticides on fruit and vegetables), alcohol consumption, inflammation, and excessive antibiotics’ medication.

2- What Is the Role of Dietary Changes in Alzheimer’s disease (AD)?

To reduce the risk of losing neurons in the hippocampus and cerebral cortex, responsible for the progressive cognitive decline (memory loss), it is necessary to consume food that is rich in compounds that promote and maintain the survival of neurons and their connectivity to each other.

• Glutathione

Glutathione is an antioxidant that prevents damage to neurons that are caused by reactive oxidative stress, such as free radicals, and heavy metals.

Substances that are metabolized in the liver and excreted in the bile require conjugation with glutathione to facilitate their absorption by the gut circulation [3].

Glutathione is mainly found in foods such as beef, poultry, eggs, milk, avocados, strawberries, oranges, blueberries, watermelon, peaches, and grapefruit.

• Polyphenols

Polyphenols are organic compounds that include flavonoids, such as quercetin, and epigallocatechin gallate. Quercetin is an inhibitor of the enzyme, BACE-1 (beta-amyloid precursor protein–cleaving enzyme 1) that has a role in the formation of beta-amyloid plaques [4].

In the gut, the microbiota transforms polyphenols into neuroprotective polyphenols that protect neurons during Alzheimer’s disease [4].  

Foods that are rich in polyphenols include cocoa products, blueberries, various spices, dried herbs, flaxseed, nuts (chestnut, hazelnut), olive and artichoke heads. 

• Curcumin (Turmeric)

Curcumin is a bioactive polyphenolic extract of turmeric that is used as a spice, food additive, and herbal medicine.

Curcumin has antioxidant, anti-inflammatory, metal binding, and neuroprotective activities that improve the cognitive functions in patients with Alzheimer’s disease (AD) [5]. 

In the gut, curcumin was suggested to favor beneficial bacteria by increasing the abundance of Bifidobacterium and Lactobacilli and reducing pathogenic bacteria such as Prevotellaceae, Enterobacteria, Enterococci, and Coriobacteriia that can affect brain health [6].

• Vitamin B6

Vitamin B6 is an essential coenzyme involved in the metabolism of glucose, fat, and proteins [7]. Vitamin B6 is also involved in lowering the level of homocysteine (made from methionine) in the blood by converting it into cysteine.

An increased homocysteine level (hyperhomocysteinemia) can result in blood vessels damage, including vessels in the brain which can affect nutrients supply to neurons leading to their death by starvation [8].

In the gut, Vitamin B6 (microbial vitamin B6) can be produced by bacteria such as Bacteroidetes and Proteobacteria, where it also contributes to the gut immunity to ensure the proper function of the gut in nutrients absorption [9].

Vitamin B6 is mainly found in meat products such as Beef, pork, chicken, and fish.

• Vitamin B12

Vitamin B12 is a coenzyme involved in fatty acids and protein metabolisms, DNA synthesis, and maturation of red blood cells.

It is also necessary for the production of myelin, a protein covering neurons, and necessary for the nervous system function through its role in the transfer of nerve impulses and metabolic support of neurons [10].

Like vitamin B6, vitamin B12 also reduces homocysteine level (hyperhomocysteinemia) and prevents the damage of blood vessels, including vessels of the brain which, and therefore, can affect nutrients supply to neurons leading to their death by starvation [11].

In the gut, certain bacteria and archaea produce vitamin B12 during food fermentation.

It is naturally present in foods such as meat, liver, milk, clams, fortified breakfast cereals, and eggs.

• Folic Acid (Vitamin B9)

Vitamin B9 is required for DNA synthesis and for the activation of vitamin B12, and therefore, indirectly plays an important role in protecting blood vessels from damage, including the brain blood vessels [12].

Many bacteria in the gut produce an active form of folic acid known as tetrahydrofolate (THF), including Bacteroides, firmicutes, actinobacteria, fusobacteria, and proteobacteria.

Many types of food contain vitamin B9; however, due to its instability (e.g., high heat cooking), it is being added to several food sources as a fortifier to prevent a vitamin B9 deficiency.

• Unsaturated Fatty Acids

Unsaturated Fatty Acids are parts of phospholipids that are necessary for the formation of the membranes of cells, including neurons. One of the most known unsaturated Fatty Acids is omega-3 polyunsaturated fatty acids [13].

In the gut, the microbiota regulates the availability and absorption of unsaturated fatty acids

Foods that are rich in omega-3 polyunsaturated fatty acids include salmon, sardines, and mackerel.

• Lecithin

Lecithin is a fatty substance composed of a mixture of phospholipids that are rich in choline, a necessary component of the neurotransmitter acetylcholine that is involved in memory, mood, muscle, and nervous system functions [14].

In the gut, food that contains lecithin is digested by the pancreas and mucosal enzymes to produce choline that is absorbed by the gut circulation.

Lecithin is mainly found in foods such as meat, poultry, fish, dairy products, and eggs.

• Caffeine

Caffeine is a stimulant of the central nervous system where it has effects on learning, memory, alertness, and concentration. Caffeine has antioxidant effects and may protect against cell damage, including damages to neurons, by reducing oxidative stress [15].

Beverages, such as coffee, tea, soft and energy drinks, are digested by the gut flora to generate caffeine that is absorbed by the intestine’s circulation.

• Prebiotics

The most common prebiotics are fructooligosaccharides, galactooligosaccharides, and trans-galactooligosaccharides, but other prebiotics plays important roles in health and aging such as insulin enriched-oligofructose, lactulose, and oligofructose [16].

They are indigestible carbohydrates that are fermented and broken down by probiotics to obtain survival energy, and short-chain fatty acids such as lactic acid, butyric acid, and propionic acid.

The administration of prebiotics such as non-starch polysaccharides was shown to improve the performance of working and recognition memory and cognitive functions [17].

Prebiotics are found in carrots, quinoa, radishes, onions, chicory roots, konjac roots, oats, yams, garlic, barley, wheat bran, berries, apples, asparagus, bananas, leeks, chia seeds, flax seeds, cocoa, coconut, jicama root, and dandelion greens.

• Probiotics

The gut contains beneficial bacteria known as good bacteria, such as Lactobacillus and Bifidobacterium. These bacteria help other gut bacteria produce nutrients for the body by providing them with nutrients that are commonly known as prebiotics [18].

Probiotics are found in yogurt, lactobacillus milk, some cheeses such as Gouda, cheddar, cottage cheese, and mozzarella, pickles, sauerkraut, kefir, kimchi, tempeh, kombucha, and miso.

3- What Is the Role of Alcohol in Alzheimer’s disease (AD)?

Excessive consumption of alcohol for a long period can damage the brain and reduce the size of the brain white matter responsible for signal transmission in the brain.

It can also cause a deficiency in vitamin B1 resulting in diseases such as Korsakoff’s syndrome characterized by alterations in short-term memory [19].

4- What Is the Role of Pesticides in Alzheimer’s disease (AD)?

Pesticides are neurotoxins that can induce oxidative stress, the fibrilization of tau and alpha-synuclein (formation of amyloid fibrils), alteration in the function of mitochondria, and the loss of neurons [20].

People such as gardeners and farmers that use pesticides for their activities are at higher risks of neurodegenerative diseases such as Alzheimer’s disease (AD).

Accidental consumption of pesticides associated with unwashed pesticides on fruit and vegetables can also increase the risk of developing Alzheimer’s disease (AD).

5- What Is the Role of Excessive Antibiotic Medication in Alzheimer’s disease (AD)?

Excessive use of antibiotics can cause an imbalance in the gut flora (microbiota) and affect the function of the probiotic population necessary for the generation of essential nutrients to the function of the body organs, including the brain [21].

6- What Is the Role of Neuroinflammation in Alzheimer’s disease (AD)?

Imbalance of the gut flora (Dysbiosis) can lead to disruptions in the gastrointestinal permeability and blood-brain barrier, that are due to the secretion of amyloid and lipopolysaccharides (LPS), known to modulate the inflammatory signaling pathway leading to neuroinflammation, neuronal injury, and ultimately to neuronal death in Alzheimer’s disease (AD) [1] [22]. 

Conclusion

To reduce the risk of Alzheimer’s disease (AD) that could be associated with an unbalance in the Gut flora (Dysbiosis), a healthy diet and the implementation of a healthy nutritive plan throughout a life of an individual is necessary.

Intake of pre-and probiotics, vitamins (B-complex vitamins), calcium, magnesium, zinc, and beta-carotene, can help prevent dysbiosis, while the consumption of processed meat, high carbohydrates containing food, and dairy products as well as excessive use of antibiotics, may promote dysbiosis.

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During the process of aging, the function of beneficial microbes, that provide necessary nutrients for the body tissues, are severely affected, while harmful microbes, that contribute to the process, such as chronic inflammation and cancer, flourish [1][2][3][4][5].

What Evidence Supports the Role of the Gut Flora in Longevity?

Several in vivo studies demonstrated that fecal microbiota transplantation from younger mice (Donor) to older (Recipient) enhanced their health and lifespan. This procedure led to the restoration of healthy microbiota in the recipient suggesting its potential application in the field of longevity.

These conclusions are reinforced through the study of progeria mice, a model characterized by an advanced aging process and that has dysfunctional gut flora (Dysbiosis), like that of progeria patients. The researchers demonstrated that fecal microbiota transplantation from wild-type mice enhanced health span and lifespan in progeroid mouse models [6].

What Bacteria Are found in the Gut?

The gut contains about 1000 species of bacteria and the most dominant species are Bacteroides, Fusobacterium, Eubacterium, Ruminococcus, Peptococcus, Peptostreptococcus, Bifidobacterium, and Clostridium.

What Are the Good Bacteria in the Gut?

The gut’s most known “good bacteria” are Lactobacillus and Bifidobacterium, also known as probiotics. These bacteria help other gut bacteria by providing them with nutrients that are commonly known as prebiotics [7].

What Are the Health Benefits of Good Bacteria?

Probiotics have been shown to prevent symptoms of allergies, diabetes type 2 (Diabetes Miletus), autoimmune diseases, rheumatoid arthritis, cancer, diarrhea, constipation, irritable bowel syndrome, Crohn’s disease, and obesity.

Because they produce lactic acid, Lactobacillus and Bifidobacterium also suppress pathogens in healthy individuals through induction of immunomodulatory molecules with antagonistic effects [8].

What food Help Good Bacteria in the Gut?

To help the growth of good bacteria in the gut, you can consume products that contain probiotics, prebiotics, or both:

1- Probiotics Food

Probiotics are found in yogurt, lactobacillus milk, some cheeses such as Gouda, cheddar, cottage cheese, mozzarella, pickles, sauerkraut, kefir, kimchi, tempeh, kombucha, and miso.

2- Prebiotic food

Prebiotics are found in carrots, quinoa, radishes, onions, chicory roots, konjac roots, oats, yams, garlic, barley, wheat bran, berries, apples, asparagus, bananas, leeks, chia seeds, flax seeds, cocoa, coconut, jicama root, and dandelion greens.

How Does Prebiotics Help Good Bacteria in the Gut?

The most common prebiotics are fructooligosaccharides, galactooligosaccharides, and trans-galactooligosaccharides, but other prebiotics plays important roles in health and aging such as insulin enriched-oligofructose, lactulose, and oligofructose.

They are indigestible carbohydrates that are fermented and broken down by probiotics to obtain survival energy, and short-chain fatty acids such as lactic acid, butyric acid, and propionic acid [8].

How Does Prebiotics Maintain health and protect against Diseases?

1- Prebiotics’ Effects on Gastrointestinal Disorders

The administration of the prebiotic fructo-oligosaccharides to patients diagnosed with irritable bowel syndrome (IBS) or Crohn’s disease (CD) has been shown to significantly improve the symptoms of the two disorders in randomized double-blind, and placebo-controlled clinical trials [9][10].

Additionally, symbiotic therapy using Lactobacillus and Bifidobacterium has been shown to reduce the risk of colorectal cancer by inhibiting the proliferation of colorectal cancer cells [11].

2- Prebiotics’ Effects on the Immune System

Prebiotics induce the expression of cytokines that promote communication between immune cells leading to improved immune response and protection against infections and other diseases such as cancer and neurodegenerative diseases.

Several studies showed that the administration of fructo-oligosaccharides improves antibody response to viral vaccines [12][13], upregulates toll-like receptor 2-mediated immune response [14], and increased phagocytosis, and the levels of NK cells and the anti-inflammatory IL-10 [15].

3- Prebiotics’ Effects on the Nervous System

The administration of prebiotics such as non-starch polysaccharides was shown to improve the performance of working and recognition memory and cognitive functions [16][17], while another prebiotic known as insulin enriched-oligofructose enhances mood and immediate memory [18]. Lactulose was also shown to improve cognitive function and health-related quality of life [19].

4- Prebiotics’ Effects on the Cardio-vascular System

The prebiotics inulin has been shown to reduce cardiovascular diseases by reducing the levels of HDL-cholesterol, triglycerides, and lipoprotein A [20], while lactulose reduces the concentrations of free fatty acids that are originated from colon absorption [21].

5- Prebiotics’ Effects on the Skin

The administration of galactooligosaccharides with and without probiotics was shown to prevent the reduction in water and keratin caused by phenols that denatures proteins and disrupt disulfide bridges in the skin keratin [22]. 

Conclusion

The gut flora is essential for health, aging, and longevity and its unbalance (Dysbiosis) can lead to severe health consequences through the lack of availability of quality nutrients that are necessary for preventing diseases such as infections, cardiovascular diseases, nervous system, gastrointestinal, skin, and immune disorders that significantly promote aging, reduces the quality of life, and shorten longevity.

Therefore, the consumption of probiotics and prebiotics can considerably prevent these consequences and ensure a longer and high quality of life.

References

[1] Leulier, F. et al. Integrative physiology: at the crossroads of nutrition, microbiota, animal physiology and human health. Cell Metab. 25, 522–534 (2017).

[2] Koeth, R. A. et al. Intestinal microbiota metabolism of L-carnitine, a nutrient in red meat, promotes atherosclerosis. Nat. Med. 19, 576–585 (2013).

[3] Loomba, R. et al. Gut microbiome-based metagenomic signature for non-invasive detection of advanced fibrosis in human nonalcoholic fatty liver disease. Cell Metab. 25, 1054–1062 (2017).

[4] Qin, J. et al. A metagenome-wide association study of gut microbiota in type 2 diabetes. Nature 490, 55–60 (2012).

[5] Zitvogel, L., Daillere, R., Roberti, M. P., Routy, B. & Kroemer, G. Anticancer effects of the microbiome and its products. Nat. Rev. Microbiol. 15, 465–478 (2017).

[6] Bárcena, Clea, et al. “Healthspan and lifespan extension by fecal microbiota transplantation into progeroid mice.” Nature medicine 25.8 (2019): 1234-1242.

[7] Wang, H., Wei, C.X., Min, L. and Zhu, L.Y., 2018. Good or bad: gut bacteria in human health and diseases. Biotechnology & Biotechnological Equipment, 32(5), pp.1075-1080.

[8] Davani-Davari, D., Negahdaripour, M., Karimzadeh, I., Seifan, M., Mohkam, M., Masoumi, S.J., Berenjian, A. and Ghasemi, Y., 2019. Prebiotics: definition, types, sources, mechanisms, and clinical applications. Foods, 8(3), p.92.

[9] Lindsay, J.O., Whelan, K., Stagg, A.J., Gobin, P., Al-Hassi, H.O., Rayment, N., Kamm, M.A., Knight, S.C. and Forbes, A., 2006. Clinical, microbiological, and immunological effects of fructo-oligosaccharide in patients with Crohn’s disease. Gut, 55(3), pp.348-355.

[10] Silk, D.B.A., Davis, A., Vulevic, J., Tzortzis, G. and Gibson, G.R., 2009. Clinical trial: the effects of a trans‐galactooligosaccharide prebiotic on faecal microbiota and symptoms in irritable bowel syndrome. Alimentary pharmacology & therapeutics, 29(5), pp.508-518.

[11] Rafter, J., Bennett, M., Caderni, G., Clune, Y., Hughes, R., Karlsson, P.C., Klinder, A., O’Riordan, M., O’Sullivan, G.C., Pool-Zobel, B. and Rechkemmer, G., 2007. Dietary synbiotics reduce cancer risk factors in polypectomized and colon cancer patients. The American journal of clinical nutrition, 85(2), pp.488-496.

[12] Langkamp‐henken, B., Bender, B.S., Gardner, E.M., Herrlinger‐garcia, K.A., Kelley, M.J., Murasko, D.M., Schaller, J.P., Stechmiller, J.K., Thomas, D.J. and Wood, S.M., 2004. Nutritional formula enhanced immune function and reduced days of symptoms of upper respiratory tract infection in seniors. Journal of the American Geriatrics Society, 52(1), pp.3-12.

[13] Lomax, A.R., Cheung, L.V., Noakes, P.S., Miles, E.A. and Calder, P.C., 2015. Inulin-type β2-1 fructans have some effect on the antibody response to seasonal influenza vaccination in healthy middle-aged humans. Frontiers in immunology, 6, p.490.

[14] Clarke, S.T., Green-Johnson, J.M., Brooks, S.P., Ramdath, D.D., Bercik, P., Avila, C., Inglis, G.D., Green, J., Yanke, L.J., Selinger, L.B. and Kalmokoff, M., 2016. β2-1 Fructan supplementation alters host immune responses in a manner consistent with increased exposure to microbial components: results from a double-blinded, randomised, cross-over study in healthy adults. British journal of nutrition, 115(10), pp.1748-1759.

[15] Vulevic, J., Drakoularakou, A., Yaqoob, P., Tzortzis, G. and Gibson, G.R., 2008. Modulation of the fecal microflora profile and immune function by a novel trans-galactooligosaccharide mixture (B-GOS) in healthy elderly volunteers. The American journal of clinical nutrition, 88(5), pp.1438-1446.

[16] Best, T., Howe, P., Bryan, J., Buckley, J. and Scholey, A., 2015. Acute effects of a dietary non-starch polysaccharide supplement on cognitive performance in healthy middle-aged adults. Nutritional neuroscience, 18(2), pp.76-86.

[17] Best, T., Kemps, E. and Bryan, J., 2009. Saccharide effects on cognition and well-being in middle-aged adults: a randomized controlled trial. Developmental neuropsychology, 35(1), pp.66-80.

[18] Smith, A.P., Sutherland, D. and Hewlett, P., 2015. An investigation of the acute effects of oligofructose-enriched inulin on subjective wellbeing, mood and cognitive performance. Nutrients, 7(11), pp.8887-8896.

[19] Prasad, S., Dhiman, R.K., Duseja, A., Chawla, Y.K., Sharma, A. and Agarwal, R., 2007. Lactulose improves cognitive functions and health‐related quality of life in patients with cirrhosis who have minimal hepatic encephalopathy. Hepatology, 45(3), pp.549-559.

[20] Russo, F., Chimienti, G., Riezzo, G., Pepe, G., Petrosillo, G., Chiloiro, M. and Marconi, E., 2008. Inulin-enriched pasta affects lipid profile and Lp (a) concentrations in Italian young healthy male volunteers. European journal of nutrition, 47(8), pp.453-459.

[21] Brighenti, F., Vuksan, V., Rao, A.V., Cunnane, S.C., Ocana, A., Corey, P. and Vezina, C., 1991. Specific types of colonic fermentation may raise low-density-lipoprotein-cholesterol concentrations. The American journal of clinical nutrition, 54(1), pp.141-147.

[22] Kano, M., Masuoka, N., Kaga, C., Sugimoto, S., Iizuka, R., Manabe, K., Sone, T., Oeda, K., Nonaka, C., Miyazaki, K. and Ishikawa, F., 2013. Consecutive intake of fermented milk containing Bifidobacterium breve strain Yakult and galacto-oligosaccharides benefits skin condition in healthy adult women. Bioscience of microbiota, food and health, 32(1), pp.33-39.

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