Why Does Your Body Need Fiber?

Why does your body need fiber?

Fiber is a type of carbohydrate found mainly in plant foods.

Unlike sugars and most starches, dietary fiber is not fully broken down and absorbed during digestion.

Even though your body handles fiber differently from other carbohydrates, fiber is still an important part of a healthy eating pattern.

It supports normal digestion and helps add bulk to the contents moving through the digestive system.

What does fiber do in the body?

Fiber can support several aspects of health.

It helps food and waste move through the digestive system and can help prevent constipation.

Fiber-rich foods can also help you feel full because they add bulk to the diet.

Different types of fiber can have different effects in the digestive system.

What are soluble and insoluble fiber?

Dietary fiber is often discussed as soluble and insoluble fiber.

Soluble fiber

Soluble fiber attracts water and can form a gel-like material during digestion.

It is found in foods such as oats, barley, beans, lentils, peas, nuts, seeds, fruits, and vegetables.

Insoluble fiber

Insoluble fiber does not dissolve in water in the same way.

It contributes bulk and helps material move through the digestive system.

Many plant foods contain a combination of different types of fiber rather than only one type.

Which foods contain fiber?

Fiber naturally occurs in plant foods.

Common sources include:

• Whole grains
• Beans and lentils
• Peas
• Vegetables
• Fruits
• Nuts
• Seeds

Highly refined foods may contain less fiber when fiber-rich parts of the original plant have been removed during processing.

Is fiber a carbohydrate?

Yes.

Fiber is one type of carbohydrate.

However, your body handles fiber differently from sugars and most starches because much of it is not digested and absorbed in the same way.

This is why Eat Ate Here tracks both Carbohydrates and Fiber as separate Core Nutrition Areas.

You can learn more in Why Does Your Body Need Carbohydrates?.

How much fiber do you need?

Fiber needs vary with factors such as age and sex.

MedlinePlus notes that recommendations for older children, adolescents, and adults commonly fall between about 21 and 38 grams of fiber per day.

Individual needs can differ.

Increasing fiber intake gradually can also be easier on the digestive system than suddenly eating much more fiber.

Can you eat too much fiber?

A very rapid increase in fiber can cause digestive discomfort such as gas, bloating, or cramps.

Fiber also works together with fluid in the digestive system.

If you are increasing fiber intake, paying attention to water and hydration is useful as well.

People with certain digestive conditions may receive different fiber advice from a health professional.

Is fiber only important for constipation?

No.

Supporting normal bowel function is one of fiber’s best-known roles, but fiber is part of a broader healthy eating pattern.

Fiber-rich foods also tend to include foods such as whole grains, fruits, vegetables, legumes, nuts, and seeds.

This means looking at food quality and variety is useful alongside simply counting grams of fiber.

How does fiber fit into overall nutrition?

Fiber should not be viewed in isolation.

The foods that provide fiber also provide carbohydrates, vitamins, minerals, and many other food components.

Instead of relying only on added or isolated fiber, eating a variety of naturally fiber-rich foods can help improve the overall quality of a diet.

Practical takeaway

Fiber is a carbohydrate that your body does not digest in the same way as sugars and starches.

It supports digestion and normal bowel function, while fiber-rich foods can also add variety and bulk to your diet.

Whole grains, legumes, fruits, vegetables, nuts, and seeds are useful sources.