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Most adults need about 22 to 34 grams of fiber a day, depending on age and sex. That range comes from the U.S. goal of 14 grams of fiber for every 1,000 calories, which the Dietary Guidelines for Americans 2020-2025 turned into targets for each age group: 28 g for women aged 19 to 30, for example, and 34 g for men of the same age. Nutrition Facts labels use one Daily Value of 28 g. Most Americans fall well short, averaging about 16.6 g a day as adults. This guide covers how much fiber per day you need, which foods supply it, how to add more without discomfort, and when a supplement can help.
Peptide Labs sells fiber supplements, and we mention three below. This article is general information, not medical advice.
Key Takeaways
- U.S. fiber goals are 14 g per 1,000 calories: about 22 to 34 g a day for adults.
- The Daily Value on food and supplement labels is 28 g.
- U.S. adults average about 16.6 g a day; more than 90% of women and 97% of men fall short.
- Beans, lentils, berries, pears, oats and chia seeds are among the richest food sources.
- Add fiber gradually and drink enough fluid to limit gas, bloating and cramps.
How much fiber per day: targets by age and sex
The goal of 14 g per 1,000 calories comes from the Institute of Medicine’s 2005 Dietary Reference Intakes, which based it on intakes linked to a lower risk of coronary heart disease. The 2020-2025 Dietary Guidelines applied that ratio to a typical calorie level for each group, which gives these daily goals:
| Age | Women and girls (g/day) | Men and boys (g/day) |
|---|---|---|
| 2 to 3 | 14 | 14 |
| 4 to 8 | 17 | 20 |
| 9 to 13 | 22 | 25 |
| 14 to 18 | 25 | 31 |
| 19 to 30 | 28 | 34 |
| 31 to 50 | 25 | 31 |
| 51 and older | 22 | 28 |
You will also see higher adult numbers: 38 g a day for men and 25 g for women up to age 50, and 30 g and 21 g after that. Those are the Institute of Medicine’s Adequate Intakes, which apply the same 14 g ratio to different calorie assumptions. MedlinePlus sums up the range as 21 to 38 g a day for older children, teens and adults. If you eat more calories than the reference level, your goal rises with them.
The newest edition, the Dietary Guidelines for Americans 2025-2030 released in January 2026, tells people to prioritize fiber-rich whole grains and says high-fiber foods support a diverse gut microbiome. Its short summary document does not print gram targets, so the age-group numbers above remain the most recent official figures.
Recommended fiber intake vs the 28 g Daily Value
The FDA’s Daily Value for dietary fiber is 28 g, which equals 14 g per 1,000 calories on a 2,000-calorie diet. The percent Daily Value on a label tells you what share of 28 g one serving provides, not what share of your personal goal. A serving with 5 g of fiber shows 18% DV, and one with 8 g shows 29%. For a man in his twenties aiming for 34 g, that same 8 g covers less than a quarter of his daily goal.
Daily fiber intake in the U.S.: the gap
National survey data from 2017 to early 2020 put average daily fiber intake at 16.6 g for adults: 18.1 g for men and 15.2 g for women. Children and teens averaged 14.1 g. The 2020-2025 Dietary Guidelines reported that more than 90% of women and 97% of men do not meet fiber recommendations, in line with more than 85% of adults eating too few fruits, vegetables and whole grains. For most people, closing the gap means adding 10 to 15 g or more a day.
Foods that supply fiber, with grams per portion
These figures come from the USDA’s FoodData Central database:
| Food | Portion | Fiber (g) |
|---|---|---|
| Chia seeds | 1 ounce | 9.8 |
| Raspberries | 1 cup | 8.0 |
| Lentils, cooked | 1/2 cup | 7.8 |
| Black beans, cooked | 1/2 cup | 7.5 |
| Avocado | 1/2 fruit | 6.7 |
| Chickpeas, cooked | 1/2 cup | 6.2 |
| Pear, with skin | 1 medium | 5.5 |
| Apple, with skin | 1 medium | 4.4 |
| Rolled or quick oats, dry | 1/2 cup | 4.1 |
| Sweet potato, baked | 1 medium | 3.8 |
| Green peas, cooked | 1/2 cup | 3.6 |
| Popcorn, air-popped | 3 cups | 3.6 |
| Almonds | 1 ounce | 3.5 |
| Banana | 1 medium | 3.1 |
| Broccoli, cooked | 1/2 cup | 2.6 |
| Whole-wheat bread | 1 slice | 1.9 |
A day with oatmeal made from half a cup of oats, a cup of raspberries, half a cup of black beans, a medium apple, half a cup of broccoli and an ounce of almonds adds up to about 30 g. Beans, lentils and berries do the heavy lifting; swapping white bread or refined crackers for whole grains adds smaller amounts throughout the day.
Soluble and insoluble fiber
MedlinePlus describes two main kinds. Soluble fiber attracts water and turns to gel during digestion, which slows digestion; oat bran, barley, nuts, seeds, beans, lentils, peas and some fruits and vegetables supply it. Insoluble fiber does not dissolve in water and adds bulk to stool; wheat bran, vegetables and whole grains are common sources. Most plant foods contain both, and U.S. guidance sets no separate target for soluble fiber. Our soluble fiber guide explains the difference in more depth.
How to add fiber without discomfort
- Go slowly. MedlinePlus warns that eating a large amount of fiber in a short time can cause gas, bloating and cramps. Cleveland Clinic suggests adding no more than about 5 g a week until you reach your goal.
- Drink fluids. Water helps fiber move through the digestive tract; adding fiber without enough fluid can leave you constipated.
- Watch fermentable fibers. Inulin and FOS, common in gummies, are fermented quickly by gut bacteria and often cause gas at first.
Too much fiber at once usually shows up as gas, bloating, cramps or loose stools. Some labels, such as MiraFIBER’s, say to reduce the serving if gas or bloating occurs; persistent symptoms deserve a call to a clinician. Our guide to fiber supplement side effects covers each fiber type.
When a supplement can fill the gap
Food comes first because beans, fruit, vegetables and whole grains bring vitamins, minerals and other plant compounds along with fiber. A supplement can add a known number of grams when your diet falls short. The fiber type matters: psyllium is a gel-forming fiber, while inulin, FOS, soluble corn fiber and wheat dextrin are non-gelling and more fermentable. Here is what three labels we carry list:
| Product | Fiber per serving | Fiber type | Label notes |
|---|---|---|---|
| MiraFIBER Gummies | 8 g (29% DV) per 4 gummies | Inulin | Adults only; reduce the serving if gas or bloating occurs |
| Metamucil Fiber Gummies with Vitamins C, D, B12 | 5 g (18% DV) per 3 gummies | Inulin and soluble corn fiber, not psyllium | Ages 12 and up; start slowly; contains xylitol |
| Benefiber Chewables | 3 g (11% DV) per 3 tablets | Wheat dextrin | Labeled gluten-free; contains wheat and soy ingredients and phenylalanine |
MiraFIBER Gummies come from the makers of MiraLAX but contain inulin fiber, not the laxative in MiraLAX. Metamucil Fiber Gummies with Vitamins C, D, B12 use inulin and soluble corn fiber rather than the psyllium in Metamucil powder. Benefiber Chewables need no water to take but contain aspartame. Compare more options in our fiber supplement comparison, our look at psyllium powder, capsules and gummies, or the fiber and gut health category.
Who should check with a clinician first
- People taking medicines: some fiber labels ask you to separate them from other medicines. Metamucil’s Drug Facts, for example, say to take it 2 or more hours before or after other drugs.
- People on GLP-1 medicines: in Wegovy trials, constipation affected 24% of adults on the drug versus 11% on placebo. Ask your prescriber before adding fiber; our semaglutide side effects guide covers the label.
- Anyone with trouble swallowing: psyllium products must carry a choking warning and be taken with a full glass of liquid.
- Anyone with warning signs: NIDDK lists blood in the stool, constant abdominal pain, vomiting, fever and losing weight without trying as reasons to see a doctor promptly.
Frequently Asked Questions
How much fiber per day should an adult eat?
About 22 to 34 g, depending on age and sex, based on 14 g per 1,000 calories. Women 19 to 30 are advised 28 g and men 19 to 30 are advised 34 g.
What is the Daily Value for fiber?
28 g. The percent Daily Value on Nutrition Facts and Supplement Facts labels is based on that number.
How much fiber do Americans actually eat?
U.S. adults average about 16.6 g a day, according to national survey data from 2017 to early 2020.
Can you eat too much fiber?
Yes. Adding a lot quickly can cause gas, bloating, cramps or loose stools, and too little fluid can lead to constipation. Increase gradually and drink fluids.
Is soluble or insoluble fiber more important?
Both matter, and most plant foods contain both. U.S. guidance sets a total fiber goal, not a separate soluble fiber target.
Do fiber gummies count toward daily fiber intake?
Yes, the grams on the label count toward your total, but gummies lack the other nutrients that fiber-rich foods provide.
Fiber is also central to gut health; see our sibling guide on how to improve gut health. Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed September 2026.
Related guides: Fiber Supplements Compared: Psyllium, Inulin, PHGG, Methylcellulose and Wheat Dextrin, Soluble Fiber Supplements: Soluble vs Insoluble Fiber, Viscosity, FDA Claims and Labels, Psyllium Husk: Powder vs Capsules vs Gummies, Flaxseed Benefits: Ground vs Whole, Oil, Constipation and Safety.