How Much Fiber Per Day Do You Need? (Chart by Age)
Quick answer: Most adults need 21 to 38 grams of fiber a day. Women need about 25 g a day up to age 50 and 21 g from 51 on. Men need about 38 g and 30 g. Another simple rule is 14 g for every 1,000 calories you eat. Most Americans eat far less than this.
Try it yourself: A 52-year-old woman eating about 1,800 calories a day: her Adequate Intake is 21 g, and the 14 g per 1,000 calories rule gives about 25 g, so aiming for about 25 g covers both. Get your own target in the fiber calculator.
How Much Fiber Per Day by Age
| Age | Women | Men |
|---|---|---|
| 19 to 50 | 25 g | 38 g |
| 51 and older | 21 g | 30 g |
Source: National Academies (Adequate Intake). Find your own target, and see how close you are today, with our fiber calculator.
Most People Don’t Get Enough
The Dietary Guidelines for Americans report that more than 90% of women and 97% of men don’t meet the recommended fiber intake. Low fiber is linked with constipation, and diets low in fiber are linked with higher risk of heart disease and type 2 diabetes.
Soluble vs. Insoluble Fiber
| Type | What it does | Good sources |
|---|---|---|
| Soluble | Forms a gel; can help lower LDL cholesterol and slow blood sugar rises | Oats, beans, lentils, apples, citrus, chia |
| Insoluble | Adds bulk and helps keep you regular | Whole wheat, bran, nuts, vegetables, fruit skins |
Most fiber-rich foods have both. You don’t need to count them separately.
High-Fiber Foods
| Food | Serving | Fiber |
|---|---|---|
| Lentils, cooked | 1/2 cup | 7.5 g |
| Black beans, cooked | 1/2 cup | 7.5 g |
| Green peas, cooked | 1 cup | 9 g |
| Chia seeds | 1 oz (about 2 tbsp) | 10 g |
| Raspberries | 1 cup | 8 g |
| Pear, with skin | 1 medium | 5.5 g |
| Whole-wheat spaghetti, cooked | 1 cup | 6 g |
| Broccoli, cooked | 1 cup | 5 g |
| Oatmeal, cooked | 1 cup | 4 g |
| Apple, with skin | 1 medium | 4.5 g |
Values from the Mayo Clinic high-fiber foods chart (based on USDA data).
How Much Fiber Per Day to Lose Weight?
There’s no special “weight loss” amount. Aim for the normal target above. Fiber helps by keeping you full for fewer calories. In a 2019 study of adults on a weight-loss diet, eating more fiber was one of the strongest predictors of how much weight people lost, whatever diet they followed. Pair it with a modest calorie deficit; see our calorie deficit calculator.
How to Add Fiber Without Bloating
- Go slowly. Add a little more each day over a few weeks.
- Drink more water as you add fiber. See the water intake calculator.
- Swap instead of adding: whole grains for white, fruit for juice.
- Add beans or lentils to soups and salads a few times a week.
Frequently Asked Questions
How much fiber per day for a woman?
25 grams a day for women 19 to 50, and 21 grams for women 51 and older.
Is 30 grams of fiber a day too much?
No, for most adults it’s fine if you build up slowly and drink enough water. There’s no official upper limit for fiber from food.
Can you eat too much fiber?
Very large amounts, especially added suddenly, can cause gas, bloating and discomfort. Increase gradually.
Do fiber supplements count toward my daily fiber?
Yes, but whole foods also give you vitamins and minerals. If you take a supplement, ask a pharmacist about timing it apart from medications.
What happens if you don’t eat enough fiber?
You’re more likely to have constipation, and low-fiber diets are linked with higher risk of heart disease and type 2 diabetes.
What is the fastest way to add fiber?
Add one high-fiber food at each meal, such as berries at breakfast, beans at lunch and a vegetable at dinner, and increase gradually over a few weeks.
Related Tools
This article is for general information only and is not medical advice. Read our Medical Disclaimer.
Sources
- Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. 2005 — https://nap.nationalacademies.org/catalog/10490
- Dietary Guidelines for Americans, 2020–2025 — https://www.dietaryguidelines.gov/
- Mayo Clinic: Chart of high-fiber foods — https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/high-fiber-foods/art-20050948
- Miketinas DC, et al. Fiber intake predicts weight loss and dietary adherence in adults consuming calorie-restricted diets: the POUNDS Lost study. J Nutr. 2019 — https://pubmed.ncbi.nlm.nih.gov/31174214/
Keep reading
More evidence-based guides for staying strong after 40.
