Fiber Intake Calculator

Dietary fiber may be the most consistently beneficial dietary component that most people dramatically under-consume. The average American eats only 15–18g of fiber per day — about half the recommended amount. This deficiency is linked to the rise in digestive disorders, metabolic disease, and obesity in Western populations eating highly processed, low-fiber diets.

Fiber feeds the gut microbiome — the trillions of bacteria living in your colon. These bacteria ferment soluble fiber into short-chain fatty acids (SCFAs) like butyrate, which fuel colon cells, reduce inflammation, and produce signaling molecules that affect everything from blood glucose regulation to mood. A high-fiber diet that supports a diverse microbiome is one of the most impactful things you can do for long-term health.

Practically, the easiest way to increase fiber intake is to add one high-fiber food to each meal. A handful of berries with breakfast (4–8g), a side salad with lunch (3–5g), a serving of legumes or whole grains at dinner (6–16g), and a piece of fruit as a snack (3–5g) can put you at or above the daily target with minimal effort.