Amid the hype around exotic supplements, one of the best-supported longevity habits is humble and cheap: eat more fiber. Most people get nowhere near enough.
The evidence
Higher dietary fiber intake is inversely associated with all-cause mortality (U.S. population study). A big reason: fiber feeds your gut microbiome, which ferments it into short-chain fatty acids that help regulate inflammation and metabolism (review). Low-fiber diets are linked to lower microbial diversity and more systemic inflammation.
How much, and from where
Aim for roughly 25–38 grams per day from whole foods (most adults get about half that). Best sources:
- Legumes — beans, lentils, chickpeas (fiber superstars).
- Vegetables & fruit — especially with skins.
- Whole grains — oats, barley, quinoa.
- Nuts & seeds — chia, flax, almonds.
Make it easy
- Add a serving of beans or lentils to one meal a day.
- Increase gradually (and drink water) to avoid bloating.
- Favor whole foods over fiber powders — the food matrix matters.
It’s one of the highest-return, lowest-cost moves in all of longevity nutrition.
Want a longevity plan built around your goals, labs, and budget? Pierre Health offers personalized, virtual-first longevity care for patients in Minnesota & Wisconsin — at the tier that fits you.
About the author: Isaac Pierre, PA-C, is a board-certified Physician Associate and founder of Pierre Health, providing virtual-first primary care, functional medicine, and longevity care to patients in Minnesota and Wisconsin.
Medical disclaimer: This article is for general educational purposes and is not medical advice. It does not establish a provider-patient relationship. Lab and test costs are typical ranges and vary by provider. Talk with a qualified clinician before changing your diet, exercise, supplement, or medication routine — especially if you have a medical condition.