Introduction
A healthy immune system will depend on microbes, which settle in the gut soon after birth. The placenta, meconium (newborn’s first poop), amniotic fluid (protective liquid in the amniotic sac), and vaginal exposure during birth are the initial sources of the microbiome's development. Breastfeeding immediately after delivery boosts the immune system's Bifidobacterium (anaerobic bacteria in the gastrointestinal tract), which, in turn, boosts immunoglobulin A (IgA), an agent that supports gut health. It also reduces the levels of the pro-inflammatory cytokine IL-6, which is usually associated with persistent and acute inflammation.
There is scientific proof that normal function of the central nervous system is associated with good gut health. A person's diet, season, environment, and overall health can together influence the composition of their gut microbiome. The microbiome of humans will undergo physiologic changes reciprocating the dietary modifications, stress, or use of medicines. Because of this alteration, the gut may become more permeable, allowing materials like bacterial metabolites and bacteria to pass from the gut lumen into the circulation.
How Do Neurons Help Establish a Gut-Brain Connection?
Neurons are the cells found in the brain and central nervous system that direct the body’s behavior, and approximately 100 billion neurons exist in the human brain. The gut contains 500 million neurons and is connected to the brain through the nervous system. The vagus nerve, being the largest in the body, connects the gut and the brain, thereby exchanging communication. Animal studies have proven that gastrointestinal problems can occur when stress signals are given through the vagus nerve. Similarly, a study in humans also proved that individuals with irritable bowel syndrome or IBS (an intestinal disorder causing stomach pain) or Crohn’s disease (a chronic inflammation of the gastrointestinal tract) had a reduced vagal tone and indicated lessened vagus nerve function. This has suggested that the vagus nerve is very important in the gut-brain axis (GBA) and its role in stress. Therefore, this establishes that one should follow a gut-brain connection diet.
How Do Neurotransmitters Help Establish a Gut-Brain Connection?
The gut and brain are connected by millions of neurons and are also connected through chemicals called neurotransmitters. Neurotransmitters that are produced in the brain help in controlling emotions and feelings. For instance, the neurotransmitter serotonin has been shown to contribute to feelings of happiness and also act in controlling the body clock. Interestingly, most of these neurotransmitters have also been produced by the trillions of gut microbes and gut cells. Serotonin is produced in the gut in an enormous proportion. Gut microbes have also been known to produce a neurotransmitter called gamma-aminobutyric acid (GABA) that holds control over feelings of anxiety and fear. This proves that there is prime importance in following a gut-brain connection diet.
What Is the Gut-Brain Axis?
The gut-brain axis is considered a bidirectional communication network that interlinks the enteric and central nervous systems. This network extends beyond anatomy and involves various communication routes, including humoral, endocrine, metabolic, and immune pathways. The gut and the brain are interconnected, thereby allowing the brain to act on intestinal activities, including the function of immune cells, and the gut to influence cognition, mood, and mental health. An unhealthy cycle of abnormal gut permeability can result in an increased systemic and localized mucosal inflammation that will result in cytokine and neurotransmitter release. By triggering the gut-brain axis (GBA), these chemical mediators can cause depression, anxiety, and memory loss. The gut microbiota can be controlled emotionally by the gut-brain axis.
What Is the Association Between Food and Mood?
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The type and quantity of food consumed by an individual will have specific impacts on mood and happiness.
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Protein consumption will slow down carbohydrate consumption and accelerate the release of norepinephrine and dopamine, which directly affects mood.
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Likewise, carbohydrate consumption can significantly increase serotonin levels, which also directly affects mood.
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Certain foods like eggs and wheat germ contain acetylcholine, a chemical that plays its part in neurotransmission and has been linked with memory, learning, and mood.
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Omega-3 fatty acids can also impact behavior and mood, and low blood levels have been associated with depression and pessimism.
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Certain foods called brain superfoods can typically affect mood. It includes food such as oily fish high in omega-3 fatty acids, Brazil nuts, bananas, oats, lentils, spinach, chicken, turkey, quinoa, and dark chocolate.
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Mood changes can influence one's food preferences, with feelings of sadness resulting in opting for comfort foods rather than healthier alternatives.
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Research has shown that alterations in diet can influence mood and happiness through its impact on the gut microbiome.
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Research has found the benefits of ketogenic diets as one of the gut-brain diets has a significant effect on epilepsy control, which is mediated by the gut microbiome.
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Studies also have proven that diet plays a major role in gut microbiome variation, with modifications of dietary habits having substantial effects on microbiome composition.
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Consuming the Mediterranean diet, which is high in saturated fats, animal protein, and sugars, also significantly affects gut microbiota diversity.
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Another noteworthy thing is that dietary changes, including a gut-brain diet, can affect gut microbiome diversity within 24 hours.
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The consumption of ultra-processed foods, especially those containing chemical additives, can have significant adverse effects on the gut environment and double the likelihood of developing diseases.
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While these foods are engineered to be appealing and affordable, they can result in negative impacts on health.
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Also, adding fermented foods such as kimchi can help keep a healthy gut, thereby acting as a gut-brain connection diet.
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A balanced consumption of seafood and poultry with a significant reduction of red meat can also be beneficial, especially to the obese population.
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Including a variety of colorful and fleshy fruits and vegetables not only triggers appetite but also is very important for providing the body with essential nutrients.
Conclusion
Researchers have found that there is a strong gut-brain connection. So, they recommend focusing on a nutritious diet rather than gut-modifying treatments like prebiotics and probiotics to improve overall health. They also suggest including whole foods and eradicating processed and ultra-processed foods, which are linked to inflammation and disease. To support a healthy gut and uplifted mood, it is recommended to integrate whole foods into one's dietary choices and steer clear of packaged or processed foods that contain undesirable additives and preservatives. Instead, always go for natural and cooked foods that have all the essential nutrients. A healthy plate can help one have a strong and happy mind.
