Gut health is a popular topic in health care these days. But what does it really mean? And why is it important?
In a recent episode of the FirstHealth and Wellness Podcast, Dr. Scott Jamison, a functional medicine physician at FirstHealth, explains what the term really means, common gut health warning signs and simple, science-backed ways to improve digestion, immunity and well-being.
When people hear “gut health,” what does that really mean? Why should it matter to the average person?
Dr. Jamison: Gut health refers to how well your gastrointestinal system functions, but its influence goes far beyond digestion. In functional medicine, the gut is often considered the “center of the universe” because it plays a foundational role in overall health.
About 70% of the immune system is located in the gut, which means gut health directly impacts inflammation, immunity and disease risk. The gut also communicates with the brain and other systems throughout the body, so when the gut is out of balance, the effects can be widespread — impacting everything from energy to mental clarity and mood.
How does the gut influence things like anxiety, depression or brain health?
The gut and brain are connected through a complex, two‑way communication system known as the gut‑brain axis, largely via the vagus nerve. Signals constantly travel from the gut to the brain and back. Research shows that a healthy gut may help:
- Reduce anxiety and depression symptoms
- Improve mood regulation
- Lower inflammation that affects brain function
Emerging research also links poor gut health to a higher risk of neurodegenerative conditions such as Parkinson’s and Alzheimer’s disease. Stress can disrupt gut health, and an unhealthy gut can worsen stress and inflammation, making this relationship truly bidirectional.
Are there symptoms people might ignore that could point to gut problems?
Some signs of poor gut health are obvious, such as:
- Bloating
- Abdominal pain
- Constipation or diarrhea
However, many patients don’t experience classic gastrointestinal symptoms. Instead, gut imbalance can show up as:
- Joint or muscle pain
- Brain fog or difficulty concentrating
- Chronic inflammation
- Unexplained fatigue
In functional medicine, the gut is often evaluated even when symptoms seem unrelated, because subtle gut issues can underlie many chronic conditions.
What makes a functional medicine approach unique when it comes to gut health?
Functional medicine focuses on understanding the root causes of illness rather than just treating symptoms. Providers look at a broad matrix of influences, including diet and nutrition, sleep and stress, exercise habits, medications and environmental exposures. This whole‑person approach helps identify why the gut may be out of balance and guides personalized testing and treatment rather than a one‑size‑fits‑all solution.
What realistic changes can people start making right now?
Some of the most effective steps are also the simplest:
- Eat more fiber: Plant‑based foods, beans, and root vegetables feed beneficial gut bacteria.
- Reduce processed foods and sugar
- Exercise regularly (without overdoing it)
- Prioritize sleep
- Limit alcohol, which can contribute to “leaky gut”
These changes alone can significantly improve gut health, and they often do it quickly.
Probiotics are everywhere. Are they necessary?
While certain probiotics can be helpful in specific situations (such as after antibiotics or surgery), they’re not always necessary for everyone. In fact, research shows that fiber alone can significantly improve gut and even brain health. Instead of relying heavily on supplements, many people benefit more from fiber-rich foods and fermented foods, which naturally support a healthy microbiome.
Which foods best support the gut microbiome?
Think about fermented foods like Kimchi, Sauerkraut, Miso, yogurt or kefir. Just 2-3 tablespoons of fermented foods daily can introduce a wide diversity of beneficial bacteria. High-fiber foods include the following:
- Beans and legumes
- Root vegetables (turnips, rutabaga, parsnips)
- Whole plant-based foods
These sorts of foods provide essential fuel for healthy gut bacteria.
When is it time to stop self‑managing and seek medical care?
Certain symptoms should never be ignored and warrant further evaluation, including:
- Blood or mucus in the stool
- Unexplained weight loss
- Sudden or severe symptom onset
These may indicate conditions like inflammatory bowel disease, diverticulitis, or colon cancer and should be evaluated by a specialist before pursuing functional medicine therapies.
Where is gut health research headed?
Exciting advances are underway, including targeted microbiome therapies, research into fecal microbiota transplantation for neurological diseases and gut‑based approaches to cancer treatment.
Despite these advances, foundational lifestyle habits like nutrition, sleep, exercise, and stress management remain the cornerstone of gut health.
Gut health affects nearly every system in the body, from immunity and inflammation to mood and brain function.
While cutting‑edge research continues to expand treatment options, the most powerful changes still start with everyday habits: eating well, moving often, sleeping enough and managing stress.
