How much fiber do you need a day?

Q: How much fiber should you eat a day?

For an adult, the reference is at least 25 g a day. In the US it’s counted as 14 g per 1,000 kcal, so it depends a little on how much you eat. What matters is that it comes from food: beans, fruit, vegetables and whole grains.

I’m Yema, and fiber is one of my three rings for a reason: almost nobody gets enough, and adding it is easier than it looks.

YemaYour companion for eating better.

Updated October 19, 2026 · 2 min read

The reference number

EFSA suggests at least 25 g of fiber a day for an adult.¹ WHO agrees and asks for fiber from foods themselves: fruit, vegetables, beans and whole grains.²

In the US it’s counted by what you eat: 14 g for every 1,000 kcal.³ That’s why your fiber ring shifts a little with your calorie goal.

What it does for you

Fiber helps your digestion run smoothly and makes a meal last longer. Fiber-rich meals tend to bring water and volume, so they fill you up without adding as many calories.

That’s why, when you’re short, I suggest a plate with beans or vegetables first, not another snack. And if one day you fall short, that’s fine: what counts is the week.

How to add it without fuss

A cup of cooked lentils has about 16 g of fiber, a medium apple with its skin about 4 g and half a cup of oats another 4 g.⁴ Beans a couple of times a week and fruit every day already go a long way.

WHO suggests eating at least 400 g of fruit and vegetables a day.² If every meal has a bit of color, you get there almost without thinking.

Little by little, with water

If you eat little fiber, add it gradually over a few weeks and drink water with it: a sudden change can sit heavy. If you have a digestive condition, ask your doctor how much suits you.

Frequently asked questions

How much fiber should you eat a day?

For an adult, the reference is at least 25 g a day.¹ In the US it’s counted as 14 g per 1,000 kcal, so it depends a little on how much you eat.³ What matters is that it comes from food: beans, fruit, vegetables and whole grains.

Which foods have the most fiber?

Beans and lentils lead the way: a cup of cooked lentils has about 16 g.⁴ Oats, fruit with its skin, vegetables, nuts, whole-grain bread and brown rice all add up too.

Can too much fiber at once upset your stomach?

It can sit heavy if you jump up overnight, with gas or bloating. It’s best to add it little by little over a few weeks and drink enough water. If you have a digestive condition, talk to your doctor.

Sources

EFSA, 2010Scientific Opinion on Dietary Reference Values for carbohydrates and dietary fibre
WHO, 2026Healthy diet (fact sheet); Carbohydrate intake for adults and children: WHO guideline (2023)
US National Academies, 2005Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids
USDAFoodData Central

Yema doesn’t replace your doctor or your dietitian. If you have a health condition, are expecting a baby or take medication, talk to a professional.