loamThe short answer
For adults under 50, common guidance is about 25 grams of fiber a day for women and 38 grams a day for men. Another simple rule from the Academy of Nutrition and Dietetics is 14 grams of fiber for every 1,000 calories you eat — which lands most people in the same 25–38 g range. After age 50, when we tend to eat less overall, targets ease slightly.
| Who | Daily fiber target |
|---|---|
| Women, 50 and under | 25 g |
| Men, 50 and under | 38 g |
| Women, over 50 | 21 g |
| Men, over 50 | 30 g |
| Any adult (calorie rule) | ~14 g per 1,000 kcal |
The fiber gap. Despite these targets, the average adult eats only about 16 g of fiber a day, and studies suggest only around 5% of adults actually hit the recommended amount. Fiber is the number almost nobody sees — which is exactly why closing the gap is such an easy win.
Why the number matters
Higher fiber intake and greater plant variety are consistently associated with a more diverse gut microbiome, steadier energy, better regularity, and long-term health. Fiber isn't one single thing, either — it comes in a few types that each do a different job:
- Soluble fiber dissolves in water, slows digestion, and feeds gut bacteria.
- Insoluble fiber adds bulk and keeps things moving — the regularity workhorse.
- Prebiotic fiber is a special subset that directly fuels beneficial microbes.
You don't need to memorise which food has which — but aiming for a mix matters more than chasing one big number. (More in our guide to soluble vs. insoluble fiber and prebiotic fiber.)
How to actually hit your target
The good news: you can close most of the gap with a few durable habits rather than a strict diet.
- Anchor meals on whole plants. Legumes, whole grains, fruit, vegetables, nuts and seeds are where fiber lives. See our high-fiber foods list for grams per 100 g.
- Add variety, not just volume. Different plants bring different fibers — the idea behind eating 30 plants a week.
- Ramp up gradually. Jumping from 15 g to 35 g overnight is the fastest way to feel bloated. Add a few grams a week and drink more water — see how to increase fiber without bloating.
- Make it visible. The single biggest reason people miss the target is that they never see the number in the first place.
A personal goal that grows with you
loam turns "eat more fiber" into a number you can actually see. It sets a personal daily goal grounded in IOM and WHO reference values, then ramps it up gently — about 3 g a week — so you reach your target over a few weeks instead of overnight. Each day it splits your fiber into soluble, insoluble and prebiotic, so you know exactly which one you're missing. Free, no account, private by design.
Download loam on the App Store →Frequently asked
How many grams of fiber should I eat a day?
About 25 g/day for women and 38 g/day for men under 50, or roughly 14 g per 1,000 calories. Over 50, targets ease to about 21 g (women) and 30 g (men).
Can you eat too much fiber?
Very high intakes — roughly 50–70 g+ a day, especially added quickly without enough water — can cause gas, bloating or cramping. For almost everyone the practical problem is too little, not too much. Raise it gradually and hydrate.
Does fiber help with regularity?
Yes — insoluble fiber in particular adds bulk and helps keep you regular, while adequate water lets fiber do its job comfortably.
Sources: U.S. Dietary Guidelines & USDA reference intakes; Academy of Nutrition and Dietetics (14 g/1,000 kcal); Cleveland Clinic and Healthline summaries of average U.S. fiber intake. loam supports general wellness and education — it is not medical advice.