Nutrition is an important modulator of gut and immune functions. European researchers focused on the role of different dietary fibres and investigated the mechanism by which they impact human health.
Epidemiological studies have led to the recommendation of 30-40g fibre intake per day. However, there are thousands of different dietary fibres in our food some with unknown bioactive effects, making advice difficult. To simplify the variety of fibres the terms soluble and insoluble have been used for classification however these physical-chemical properties hardly correlate with physiological health effects.
Further details: Beneficial food for the immune system