July 5, 2026 · Guide · By Craig Rouskey

How to improve gut health, ranked by what actually works.

“Gut health” is a huge phrase attached to a lot of noise. Strip it down and the levers that genuinely change your microbiome are boring, well-evidenced, and mostly free. Here they are, in order of impact.

1. Eat more plant diversity (the biggest lever)

The strongest predictor of a healthy microbiome in the research isn't any single superfood — it's diversity. People who eat 30 or more different plant types per week have markedly more diverse gut bacteria than those eating 10 or fewer. Every different plant feeds a different set of microbes. Count widely: herbs, spices, nuts, seeds, legumes, whole grains, and every color of vegetable all count. This one habit outperforms almost everything else on this list.

2. Feed your bacteria prebiotic fiber

Within that diversity, prioritize prebiotic-rich foods — onions, garlic, leeks, asparagus, oats, legumes, and slightly-green bananas. These fibers reach the colon intact and ferment into short-chain fatty acids that feed your gut lining. This is the prebiotic half of the equation, and food is the best source.

3. Add fermented foods

Yogurt, kefir, sauerkraut, kimchi, miso, and unpasteurized fermented vegetables deliver live microbes and the metabolites they produce. A well-known Stanford study found that a diet high in fermented foods increased microbiome diversity and lowered inflammatory markers — more consistently, in fact, than a high-fiber diet alone in that trial. A few tablespoons daily is plenty.

4. Protect your sleep

The gut runs on a circadian clock. Short and irregular sleep measurably shifts microbiome composition and worsens the very symptoms — bloating, irregularity, cravings — people blame on food. Seven to nine hours on a consistent schedule is gut care, even though it never gets shelved in the supplement aisle.

5. Manage stress (the gut-brain axis is real)

Your gut and brain are wired together through the vagus nerve. Chronic stress slows motility, increases gut permeability, and shifts the microbial balance. You don't need to meditate for an hour — regular walks, breathwork, and actual downtime measurably help the gut. Stress is not “in your head” when it comes to digestion; it's in your gut too.

6. Move your body

Regular moderate exercise independently increases microbiome diversity and supports healthy motility — part of why movement relieves constipation. It doesn't need to be intense; consistent daily activity is what shows up in the data.

7. Use a targeted probiotic for a specific complaint

Here is where supplements fit — last, and precisely. A probiotic is not a substitute for the six habits above; it's a precision tool for a specific problem the fundamentals haven't fully solved. Bloating, irregularity, stress-gut, skin, immunity — each maps to different strains. A generic 50-billion-CFU capsule is not the answer; the strain matched to your issue is. If you're not sure which, the quiz takes about a minute.

What to skip

Ignore the noise: mega-dose CFU counts, “detox” cleanses (your liver and kidneys already do that), and elimination diets adopted without cause — cutting whole food groups usually reduces the diversity that gut health depends on. When in doubt, add variety rather than subtract foods.

When to see a doctor

Persistent pain, blood in stool, unexplained weight loss, or a sudden lasting change in bowel habits are not gut-wellness problems — they're reasons to see a gastroenterologist. Conditions like IBD, celiac disease, and SIBO need diagnosis, not just better habits.

This article is for education and does not diagnose, treat, cure, or prevent any disease. GoodOnes™ formulations support everyday gut function; they are not a substitute for medical care. If your symptoms are severe, persistent, or accompanied by warning signs, see a licensed clinician.

About the author

Craig Rouskey · CEO, Flore Inc. & Microbiome Scientist

MSc Molecular Biology, Microbiology, Biochemistry & Immunology (SIU). Craig is the scientist behind the GoodOnes™ targeted-probiotic line, built on a longitudinal dataset of 23,447 sequenced microbiomes. Former leadership at Renegade Bio, Pando Nutrition, and Bionascent; TEDxBellevue speaker on citizen science and precision health.