Fiber and the Gut – What Actually Happens in the Digestive System
An understandable overview of how fiber is processed in the body. Fiber is an integral part of a balanced diet and is often considered in the context of the digestive system.
But what actually happens in the body when fiber-rich foods are consumed? And why do certain food components reach the large intestine?
What are dietary fibers?
Dietary fibers are components of plant-based foods that are not completely digested by the human body.
They are found in, among other things:
- Whole grain products
- Vegetables
- Legumes
- Seeds and nuts
The journey through the digestive tract
After food intake, processing begins in the digestive system.
Various steps can be distinguished:
- Uptake in the stomach
- Further processing in the small intestine
- Absorption of many nutrients
- Forwarding of indigestible components
Dietary fibers are not completely broken down and reach deeper sections of the intestine.
What happens in the large intestine?
A variety of microorganisms are located in the large intestine. When dietary fibers reach this area, they encounter these microorganisms.
These interactions are part of natural digestive processes and are scientifically investigated.
Differences at a glance
Component and processing in the body:
Sugar - rapid absorption in the small intestine
Dietary fibers - reach the large intestine
Complex carbohydrates (e.g., 2-fucosyllactose) - also reach deeper sections of the intestine
Soluble and insoluble dietary fibers
Dietary fibers can be broadly divided into two groups:
Soluble dietary fibers
- are found, for example, in oats, fruits, or legumes
- can bind water
Insoluble dietary fibers
- are found, for example, in whole grain products
- remain largely unchanged
Both forms differ in their properties in the digestive tract.
Further content
Nutrition in everyday life
Fiber-rich foods can be easily integrated into everyday life.
Examples:
- Oatmeal
- Legumes
- Vegetables
- Seeds
Discover 7 gut-friendly recipes
Suitable products
As part of a balanced diet, dietary supplements can be used as a complement.
FAQ – Dietary fibers and nutrition
What are dietary fibers?
Dietary fibers are indigestible components of plant-based foods. They mainly belong to complex carbohydrates and are found primarily in whole grain products, vegetables, fruits, legumes, and seeds. Unlike other nutrients, they are not completely broken down in the small intestine and therefore reach the large intestine.
Why do dietary fibers reach the large intestine?
Dietary fibers can only be partially or not at all broken down by the body's own digestive enzymes in the small intestine. Therefore, they pass through the small intestine largely unchanged and reach the large intestine, where they are further processed.
This process is a normal part of the digestion of plant food components.
Which foods contain dietary fibers?
Dietary fibers are exclusively found in plant-based foods.
Typical sources include:
- Whole grain products like oatmeal or whole wheat bread
- Vegetables like broccoli, carrots, or cabbage
- Legumes like lentils, beans, and chickpeas
- Fruits, especially with skin
- Nuts and seeds
A varied diet usually combines several of these foods.
What role do dietary fibers play in the body?
Dietary fibers are part of a balanced diet and are consumed as part of a varied food selection. They contribute to the structure of food and pass through the digestive tract without being completely broken down.
Thus, they are a natural component of nutrition, especially in plant-based diets.
Note
This article is for general information only and does not replace medical advice. Dietary supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.