Fibre: understand the properties before the number

Not one single substance

Dietary fibre includes components with different structures and properties. They are not broken down and absorbed in the human small intestine like ordinary digestible carbohydrates. Solubility and fermentability vary, so one total in grams does not describe every property. The Max Rubner-Institut's scientific overview (German) explains the group and current measurement methods.

A guideline is an orientation

The DGE gives adults a guideline of at least 30 grams a day. It is guidance for the diet as a whole, not an instruction to add a large amount at once or weigh every meal precisely. People who currently eat little fibre can increase gradually and drink sufficiently. Tolerance and individual circumstances vary.

DGE: Fibre questions and answers (German).

The number needs a reference quantity

This invented example refers to 100 grams:

This is a portion-size calculation. On its own, it does not show that a whole meal is balanced or that everyone should eat this portion.

Food values need context

The source, reference quantity and food state must match. A figure for a dry food must not silently become a figure for a cooked portion. Different analytical methods and database updates can also affect reported fibre values; the Max Rubner-Institut describes this transition for fibre data. One high figure is not a complete quality score for a food.

This article does not replace an individual assessment of persistent symptoms.