Gut Health – The foundation we didn’t think to build

Gut health has become one of the most talked-about topics in modern wellness—and for good reason. Research over the past two decades has revealed that the digestive system is far more than a simple food-processing organ. It plays a central role in nutrient absorption, immune function, hormone regulation, metabolism, and even mental health through the gut-brain axis.

At the same time, Ayurveda, the traditional system of medicine that originated in India over 3,000 years ago, has long emphasized the importance of healthy digestion as the foundation of overall wellbeing. According to Ayurvedic philosophy, optimal health begins with a strong digestive fire, known as Agni, while poor digestion contributes to the accumulation of Ama, or undigested metabolic waste, which is believed to disrupt balance within the body.

Although Ayurveda and modern medicine use different frameworks to explain health and disease, there is growing scientific interest in understanding whether traditional dietary practices, herbal medicines, stress management techniques, and lifestyle recommendations may support digestive health through mechanisms that align with contemporary research on the gut microbiome.

This article explores what modern science tells us about gut health, how Ayurveda approaches digestion, where the two perspectives overlap, and practical strategies that combine evidence-based medicine with traditional wisdom.

What Is Gut Health?

Gut health refers to the proper functioning of the gastrointestinal (GI) tract and the complex community of microorganisms that inhabit it, collectively known as the gut microbiome.

A healthy digestive system performs several essential functions:

Efficient digestion of food
Absorption of nutrients
Protection against harmful pathogens
Regulation of immune responses
Production of beneficial compounds such as short-chain fatty acids
Communication with the brain through the gut-brain axis

The human digestive tract contains trillions of microorganisms—including bacteria, viruses, fungi, and archaea—that work together to influence many aspects of health. Scientists estimate that hundreds of bacterial species coexist within the gut, creating a highly dynamic ecosystem that changes throughout life in response to diet, medications, environment, sleep, stress, and physical activity.

Rather than aiming for a single “perfect” microbiome, researchers now recognize that microbial diversity and resilience are more important indicators of gut health than the presence or absence of specific bacterial species.

Why Gut Health Matters

Poor gut health has been associated with numerous chronic conditions, although researchers continue to investigate whether microbiome changes are a cause, consequence, or contributing factor.

Current evidence links alterations in the gut microbiome with:

Irritable bowel syndrome (IBS)
Inflammatory bowel disease (IBD)
Obesity
Type 2 diabetes
Cardiovascular disease
Allergies
Autoimmune conditions
Anxiety and depression
Non-alcoholic fatty liver disease

Importantly, these associations do not necessarily imply direct causation. The microbiome is influenced by many interacting lifestyle and genetic factors, making it difficult to isolate its independent role.

Signs Your Gut May Need Support

Digestive symptoms vary from person to person, but common signs that warrant attention include:

Frequent bloating
Excessive gas
Constipation
Diarrhea
Abdominal discomfort
Acid reflux
Food intolerances
Persistent fatigue
Poor appetite
Irregular bowel movements

Some individuals may also experience symptoms outside the digestive tract, such as skin changes, brain fog, or low mood. While these symptoms are sometimes discussed in relation to gut health, they are non-specific and can have many potential causes. Anyone experiencing persistent or severe symptoms should seek evaluation from a qualified healthcare professional to rule out underlying medical conditions.

The Gut-Brain Connection

One of the most exciting discoveries in modern medicine is the gut-brain axis—a complex communication network linking the digestive system and the central nervous system.

Communication occurs through multiple pathways:

The vagus nerve
Immune signaling
Hormones
Microbial metabolites
Neurotransmitter production

Interestingly, many gut bacteria produce compounds that influence the nervous system. For example, certain microbes participate in the metabolism of tryptophan, a precursor of serotonin, while others produce short-chain fatty acids that help regulate inflammation and maintain the intestinal barrier.

Although headlines often claim that “90% of serotonin is made in the gut,” this statement requires context. Most serotonin produced in the gastrointestinal tract regulates digestive function and does not cross the blood-brain barrier. Nevertheless, gut microbes can influence brain function through several indirect mechanisms that continue to be actively studied.

Understanding Ayurveda’s View of Digestion

Ayurveda is one of the world’s oldest systems of holistic medicine. Rather than focusing solely on disease treatment, it emphasizes maintaining balance among the body, mind, environment, and daily lifestyle.

In Ayurveda, digestion is considered the cornerstone of health.

Instead of describing bacteria, immune cells, or neurotransmitters, Ayurveda uses concepts such as:

Agni (digestive fire)
Ama (metabolic waste resulting from impaired digestion)
Doshas (functional energies: Vata, Pitta, and Kapha)
Ojas (vitality and resilience)

These concepts represent traditional philosophical frameworks rather than anatomical or biochemical structures recognized by modern medicine.

What Is Agni?

Agni literally translates as “fire.”

In Ayurvedic philosophy, Agni represents the body’s capacity to digest food, absorb nutrients, and transform them into energy and healthy tissues.

Strong Agni is traditionally associated with:

Comfortable digestion
Regular appetite
Efficient metabolism
Consistent energy
Clear elimination
Overall vitality

Conversely, weakened or irregular Agni is believed to contribute to incomplete digestion and the formation of Ama.

From a modern scientific perspective, there is no direct biological equivalent to Agni. However, some researchers suggest that the concept broadly reflects digestive efficiency, including gastric acid secretion, digestive enzyme activity, intestinal motility, nutrient absorption, and metabolic processes.

It is important not to equate Agni directly with any single physiological mechanism.

Ama: A Traditional Concept

Ama is often translated as “toxins,” but this translation can be misleading.

In Ayurvedic texts, Ama refers to incompletely digested food or metabolic waste that accumulates when digestion is impaired.

Traditional descriptions of Ama include:

Heaviness
Lethargy
Coated tongue
Poor digestion
Loss of appetite
Sluggishness

Modern medicine does not recognize Ama as a measurable biological substance.

Some integrative medicine researchers have proposed that Ama may conceptually resemble the consequences of impaired digestion, chronic low-grade inflammation, altered microbial metabolites, or intestinal dysfunction. However, these comparisons remain theoretical and should not be interpreted as established scientific fact.

Recognizing this distinction helps preserve both scientific accuracy and respect for traditional Ayurvedic philosophy.

The Three Doshas and Digestive Patterns

Ayurveda categorizes individuals according to three primary doshas:

Vata

Associated with movement.

Individuals with Vata predominance may traditionally experience:

Irregular appetite
Gas
Bloating
Constipation
Variable digestion

Warm, cooked, nourishing meals are commonly recommended.

Pitta

Associated with transformation.

Pitta digestion is traditionally described as:

Strong appetite
Efficient digestion
Tendency toward acidity
Heartburn
Loose stools when imbalanced

Cooling foods and moderation of spicy or acidic meals are often advised.

Kapha

Associated with stability.

Kapha digestion is traditionally characterized by:

Slower metabolism
Reduced appetite
Heaviness after eating
Sluggish digestion

Lighter meals, regular exercise, and warming spices are commonly recommended.

Although personalized nutrition based on doshas remains central to Ayurvedic practice, modern scientific evidence supporting dosha-based dietary prescriptions is still limited. Research exploring potential genetic, metabolic, and microbiome correlations is ongoing but remains in its early stages.

Where Modern Science and Ayurveda Overlap

Despite using different languages and theoretical models, Ayurveda and modern medicine share several practical recommendations for supporting digestive health.

Both approaches emphasize:

Eating a diverse, nutrient-rich diet
Prioritizing whole foods over ultra-processed foods
Managing chronic stress
Maintaining regular sleep patterns
Engaging in physical activity
Eating mindfully without rushing
Avoiding overeating
Supporting healthy digestion through consistent daily habits

These lifestyle practices are supported by a growing body of scientific evidence showing their positive effects on digestion, metabolic health, and the gut microbiome.

While Ayurveda explains these benefits through concepts such as Agni and dosha balance, modern medicine attributes them to mechanisms involving microbial diversity, immune regulation, circadian biology, digestive physiology, and neuroendocrine signaling.

Understanding these complementary perspectives allows individuals to appreciate traditional wisdom while making informed decisions based on current scientific knowledge.

The Gut Microbiome: Your Body’s Hidden Ecosystem

One of the most significant advances in modern medicine has been the discovery of the gut microbiome—a diverse community of trillions of microorganisms that live primarily in the large intestine. These microbes include bacteria, viruses, fungi, and other microorganisms that work together to support many aspects of human health.

Rather than being passive inhabitants, gut microbes actively participate in important biological processes. They help digest dietary fibre, produce vitamins such as vitamin K and certain B vitamins, create beneficial short-chain fatty acids (SCFAs), support immune function, and help maintain the integrity of the intestinal lining.

Among the SCFAs, butyrate has received particular attention because it serves as the primary fuel source for cells lining the colon. Butyrate also helps regulate inflammation and supports the gut barrier, reducing intestinal permeability under healthy conditions.

Scientists now understand that a healthy microbiome is characterized more by diversity and resilience than by the presence of a specific “ideal” bacterial profile. Each person’s microbiome is unique and influenced by genetics, diet, medications, physical activity, sleep, stress, age, and environmental exposures.

What Can Harm the Gut Microbiome?

The composition of the gut microbiome can change rapidly, sometimes within days. While these changes are often reversible, long-term lifestyle habits have the greatest influence on microbial health.

Factors associated with reduced microbial diversity include:

Diets high in ultra-processed foods
Low fibre intake
Frequent or unnecessary antibiotic use
Chronic psychological stress
Poor sleep quality
Sedentary lifestyle
Excessive alcohol consumption
Smoking

This does not mean occasional indulgences permanently damage the microbiome. Rather, consistent healthy habits appear to have the greatest long-term impact.

Feeding Your Gut: Why Fibre Matters

If there is one dietary recommendation consistently supported by research, it is increasing fibre intake.

Unlike many nutrients that are absorbed in the small intestine, dietary fibre reaches the colon where it becomes food for beneficial bacteria. This process, known as fermentation, produces SCFAs that support digestive and metabolic health.

High-fibre foods include:

Vegetables
Fruits
Legumes
Whole grains
Nuts
Seeds

Research consistently shows that diets rich in plant diversity are associated with greater microbial diversity.

Instead of focusing on a single “superfood,” experts increasingly recommend eating 30 or more different plant foods each week, including herbs, spices, fruits, vegetables, legumes, nuts, seeds, and whole grains. This variety provides a broader range of fibres and phytochemicals that nourish different microbial species.

Ayurvedic Nutrition and Gut Health

Ayurveda has always emphasized that digestion depends not only on what we eat, but also how and when we eat.

Although these recommendations arise from traditional philosophy rather than modern clinical trials, several align remarkably well with current nutritional science.

Traditional Ayurvedic dietary practices include:

Eating freshly prepared meals
Choosing minimally processed foods
Eating at regular times each day
Avoiding overeating
Eating mindfully without distractions
Consuming warm meals when appropriate
Adjusting food choices according to individual constitution and season

Modern research supports several of these habits. For example, regular meal timing may help maintain circadian rhythms that influence digestive function and metabolism. Mindful eating has also been associated with improved digestion, reduced overeating, and greater awareness of hunger and fullness cues.

Are Warm Foods Better for Digestion?

Ayurveda generally recommends warm, freshly cooked foods because they are believed to support Agni.

From a scientific perspective, there is limited evidence that warm foods are universally superior to cold foods. However, cooked foods may be easier to digest for some individuals, particularly those experiencing digestive discomfort, because cooking softens plant cell walls and can improve digestibility.

Ultimately, the best dietary pattern depends on individual preferences, tolerance, medical conditions, and nutritional needs.

Ayurvedic Herbs for Gut Health: What Does the Science Say?

Many Ayurvedic herbs have been used for centuries to support digestion. Modern research is beginning to investigate these traditional remedies, although evidence varies considerably.

Triphala

Triphala is one of Ayurveda’s most well-known herbal formulations. It combines three fruits:

Amalaki (Emblica officinalis)
Bibhitaki (Terminalia bellirica)
Haritaki (Terminalia chebula)

Laboratory and animal studies suggest Triphala possesses antioxidant, anti-inflammatory, and antimicrobial properties. Preliminary human studies indicate it may help improve bowel regularity and digestive comfort in some individuals.

However, larger, well-designed clinical trials are still needed before firm conclusions can be drawn regarding its effectiveness for chronic digestive conditions.

Ginger

Ginger is among the best-studied medicinal plants for digestive health.

Research suggests ginger may:

Reduce nausea
Promote gastric emptying
Improve symptoms of indigestion in some individuals
Reduce pregnancy-related nausea
Help alleviate postoperative nausea

Ginger’s active compounds, including gingerols and shogaols, appear to influence gastrointestinal motility and possess anti-inflammatory properties.

While ginger may support digestive comfort, it should not be considered a cure for underlying gastrointestinal disease.

Turmeric

Turmeric contains curcumin, a polyphenol with well-documented anti-inflammatory and antioxidant effects.

Studies suggest curcumin may:

Help reduce inflammatory activity
Support intestinal barrier function
Influence gut microbial composition
Improve symptoms in some inflammatory conditions

However, curcumin is naturally poorly absorbed. Many commercial supplements include piperine (from black pepper) or specialized formulations to enhance bioavailability.

Evidence for turmeric specifically improving gut microbiome health remains promising but preliminary.

Fennel

Fennel has traditionally been used after meals to reduce bloating and support digestion.

Limited clinical studies suggest fennel may help reduce symptoms such as abdominal discomfort and gas, particularly when combined with other herbal preparations. More high-quality research is needed.

Cumin and Coriander

Both cumin and coriander are common ingredients in Ayurvedic cooking.

Laboratory studies suggest they possess antioxidant and antimicrobial properties, but clinical evidence supporting significant digestive benefits in humans remains limited.

Using these spices as part of a balanced diet is generally considered safe for most healthy adults.

Fermented Foods: Ancient Wisdom Meets Modern Science

Fermented foods have been consumed across cultures for thousands of years.

Examples include:

Yogurt
Kefir
Sauerkraut
Kimchi
Miso
Tempeh

These foods may contain live microorganisms that contribute to microbial diversity, although not all fermented foods qualify as probiotics.

Research suggests regular consumption of fermented foods may increase microbiome diversity and reduce certain inflammatory markers in healthy adults.

Traditional Indian diets have long included naturally fermented foods, illustrating another area where ancient dietary practices intersect with modern nutritional science.

Probiotics and Prebiotics

The terms probiotic and prebiotic are often confused.

Probiotics are live microorganisms that, when consumed in adequate amounts, provide a health benefit.

Prebiotics are non-digestible fibres that feed beneficial gut bacteria.

Good prebiotic foods include:

Garlic
Onions
Leeks
Asparagus
Oats
Bananas
Chicory root
Jerusalem artichokes

Current evidence suggests probiotics may be beneficial for certain conditions, including antibiotic-associated diarrhoea, some forms of irritable bowel syndrome (IBS), and specific infectious diarrhoeas. However, effects are strain-specific, meaning one probiotic cannot be assumed to provide the same benefits as another.

For healthy individuals, obtaining prebiotic fibre through a varied, plant-rich diet remains one of the most consistently supported strategies for maintaining gut health.

Stress, Digestion, and the Gut-Brain Axis

Both Ayurveda and modern medicine recognize that emotional wellbeing profoundly influences digestion.

Under chronic stress, the body activates the hypothalamic-pituitary-adrenal (HPA) axis, releasing stress hormones such as cortisol. These changes can alter gut motility, increase intestinal permeability in some individuals, influence immune responses, and modify the composition of the gut microbiome.

Ayurveda has long emphasized practices that calm the mind, including:

Meditation
Yoga
Breathwork (Pranayama)
Spending time in nature
Establishing consistent daily routines

Modern research supports many of these approaches. Regular mindfulness meditation and yoga have been associated with reduced stress, improved quality of life, and, in some studies, improvements in digestive symptoms among people with disorders such as IBS.

Although researchers continue to explore the precise biological mechanisms, stress reduction is now widely recognized as an important component of digestive health.

Sleep and Gut Health

Sleep and the gut microbiome appear to have a bidirectional relationship.

Poor sleep may influence microbial composition, while disruptions in the microbiome may affect sleep quality through immune and neurochemical pathways.

Both Ayurveda and circadian biology emphasize maintaining consistent daily rhythms.

Healthy sleep habits include:

Going to bed at a regular time
Limiting screen exposure before bedtime
Avoiding heavy late-night meals
Getting morning sunlight exposure
Maintaining a consistent wake time

These practices support both digestive function and overall health.

Exercise and Gut Health

Physical activity benefits nearly every system in the body—including the digestive tract.

Research suggests that regular moderate exercise may:

Increase microbial diversity
Improve bowel motility
Reduce chronic inflammation
Support metabolic health
Enhance immune function
Improve mood through the gut-brain axis

Walking after meals, a long-standing recommendation in Ayurveda, also has scientific support. Gentle movement after eating may help regulate blood glucose levels, promote gastric emptying, and improve digestion.

The goal isn’t intense exercise every day. Most evidence suggests that 150 minutes of moderate physical activity per week, combined with strength training twice weekly, supports both digestive and overall health.

A Practical Ayurvedic and Evidence-Based Gut Health Plan

The best approach to gut health combines sustainable lifestyle habits with evidence-based nutrition. While Ayurveda provides a holistic framework centred on digestion and daily routine, modern science offers insight into the biological mechanisms behind these recommendations.

1. Eat More Plants

Aim to include a wide variety of plant foods each week, such as vegetables, fruits, legumes, whole grains, nuts, seeds, herbs, and spices. Diversity in plant intake supports a more diverse gut microbiome.

2. Prioritize Fibre

Most adults consume less fibre than recommended. Gradually increasing fibre intake while drinking adequate water can support healthy digestion and beneficial gut bacteria.

3. Eat Mindfully

Avoid rushing through meals. Eating slowly, chewing thoroughly, and minimizing distractions may improve digestion and help regulate appetite.

4. Manage Stress

Incorporate practices such as meditation, yoga, breathing exercises, journaling, or spending time outdoors. Chronic stress can affect digestion, gut motility, and the gut microbiome.

5. Sleep Well

Aim for 7–9 hours of quality sleep each night. Maintaining a consistent sleep schedule supports circadian rhythms that influence digestion and metabolism.

6. Stay Physically Active

Regular movement benefits both digestive function and the gut microbiome. Even a 10–15 minute walk after meals can be helpful.

7. Use Herbal Supplements Wisely

Although herbs such as ginger and turmeric have promising evidence, “natural” does not always mean safe. Herbal supplements can interact with medications and may not be appropriate for everyone, particularly during pregnancy or in people with chronic medical conditions. Always consult a qualified healthcare professional before beginning any supplement regimen.

Common Gut Health Myths

Myth 1: You Need a Gut Cleanse

There is no scientific evidence that commercial detoxes or colon cleanses improve gut health in healthy individuals. The liver, kidneys, lungs, skin, and digestive system already work together to eliminate waste products efficiently.

Instead of detoxes, focus on eating a fibre-rich diet, staying hydrated, and maintaining healthy lifestyle habits.

Myth 2: Everyone Needs a Probiotic

Not necessarily.

Different probiotic strains have different effects, and many healthy people may not benefit from routine supplementation. A varied diet rich in fibre and fermented foods often provides sufficient support for gut health.

Myth 3: All Bloating Means an Unhealthy Gut

Bloating is common and can occur for many reasons, including eating too quickly, consuming large meals, hormonal changes, food intolerances, constipation, or gastrointestinal conditions such as irritable bowel syndrome (IBS).

Persistent, severe, or unexplained bloating should be assessed by a healthcare professional.

Myth 4: Ayurveda Can Replace Conventional Medical Care

Ayurveda can complement healthy lifestyle practices and may offer supportive strategies for digestive wellness. However, it should not replace evidence-based medical treatment for serious gastrointestinal conditions such as inflammatory bowel disease, coeliac disease, gastrointestinal bleeding, or colorectal cancer.

An integrative approach—combining conventional medicine with safe, evidence-informed complementary practices—is often the most appropriate strategy.

Frequently Asked Questions

What is the best Ayurvedic herb for gut health?

There is no single “best” herb. Ginger has the strongest clinical evidence for reducing nausea and improving gastric emptying, while turmeric shows promise for its anti-inflammatory properties. Triphala has a long history of traditional use and emerging evidence for supporting bowel regularity, but larger clinical trials are needed.

Can Ayurveda improve the gut microbiome?

Research is still developing. Certain Ayurvedic dietary patterns, plant-rich foods, spices, fermented foods, and lifestyle practices may indirectly support a healthy gut microbiome. However, there is currently insufficient evidence to conclude that Ayurvedic therapies directly alter the microbiome in predictable or clinically significant ways.

Is gut health linked to mental health?

Yes. The gut and brain communicate through the gut-brain axis, involving nerves, hormones, immune signals, and microbial metabolites. Although researchers are still exploring these relationships, growing evidence suggests that gut health and mental wellbeing influence one another.

Can improving gut health boost immunity?

A significant portion of the body’s immune cells reside within the gastrointestinal tract. A healthy gut barrier and balanced microbiome help regulate immune responses. However, no single food or supplement can “boost” immunity. Instead, healthy digestion, adequate nutrition, regular exercise, sufficient sleep, and stress management work together to support normal immune function.

Should everyone follow an Ayurvedic diet?

Not necessarily. Ayurveda emphasizes individualized nutrition based on constitution, environment, season, and health status. Modern nutrition similarly recognizes that there is no one-size-fits-all diet. The most sustainable eating pattern is one that is balanced, enjoyable, culturally appropriate, and supports long-term health.

Key Takeaways

Gut health plays an essential role in digestion, immunity, metabolism, and communication between the gut and brain. While many aspects of the microbiome remain an active area of research, current evidence consistently supports eating a diverse, fibre-rich diet, engaging in regular physical activity, managing stress, sleeping well, and limiting ultra-processed foods.

Ayurveda offers a holistic perspective that has emphasized digestive health for thousands of years. Concepts such as Agni and mindful eating encourage individuals to pay attention to digestion, routine, and overall balance. Although these traditional concepts do not have direct scientific equivalents, several Ayurvedic lifestyle recommendations align with modern evidence-based advice.

Rather than viewing Ayurveda and modern medicine as competing systems, an integrative approach allows us to appreciate the strengths of both. Combining traditional wisdom with rigorous scientific research provides a balanced, practical framework for supporting digestive health and overall wellbeing.

References

Cryan JF, O’Riordan KJ, Cowan CSM, et al. The Microbiota–Gut–Brain Axis. Physiological Reviews. 2019;99(4):1877–2013.
Valdes AM, Walter J, Segal E, Spector TD. Role of the gut microbiota in nutrition and health. BMJ. 2018;361:k2179.
Lynch SV, Pedersen O. The Human Intestinal Microbiome in Health and Disease. New England Journal of Medicine. 2016;375:2369–2379.
Sonnenburg JL, Bäckhed F. Diet–Microbiota Interactions. Nature. 2016.
Makki K, Deehan EC, Walter J, Bäckhed F. The Impact of Dietary Fibre on Gut Microbiota. Cell Host & Microbe. 2018.
Hills RD Jr, Pontefract BA, Mishcon HR, et al. Gut Microbiome: Profound Implications for Diet and Disease. Nutrients. 2019.
Kho ZY, Lal SK. The Human Gut Microbiome. Singapore Medical Journal. 2018.
Bishehsari F, Voigt RM, Keshavarzian A. Circadian Rhythms and the Gut Microbiota. Gastroenterology. 2020.
Mayer EA, Tillisch K, Gupta A. Gut/Brain Axis and the Microbiota. Journal of Clinical Investigation. 2015.
Sanders ME, Merenstein DJ, Reid G, et al. Probiotics and Prebiotics in Intestinal Health. Nature Reviews Gastroenterology & Hepatology. 2019.
Gibson GR, Hutkins R, Sanders ME, et al. Consensus Statement on Prebiotics. Nature Reviews Gastroenterology & Hepatology. 2017.
Marco ML, Sanders ME, Gänzle M, et al. Fermented Foods and Health. Nature Reviews Gastroenterology & Hepatology. 2021.
NIH National Center for Complementary and Integrative Health. Digestive Health and Complementary Medicine.
World Gastroenterology Organisation. Global Guidelines: Probiotics and Prebiotics.
Peterson CT, Denniston K, Chopra D. Therapeutic Uses of Triphala in Ayurvedic Medicine. Journal of Alternative and Complementary Medicine. 2017.
Mao QQ, Xu XY, Cao SY, et al. Bioactive Compounds and Pharmacological Effects of Ginger. Food Science & Human Wellness. 2019.
Hewlings SJ, Kalman DS. Curcumin: A Review of Its Effects on Human Health. Foods. 2017.
Integrative Medicine Research. Ayurveda and the Human Microbiome: Emerging Perspectives.
Cell. Diet Rapidly Alters the Human Gut Microbiome.
WHO. Healthy Diet Fact Sheet.

Gut Health and Ayurveda: A Science-Backed Guide to Better Digestion and Overall Wellness