People with adverse food reactions or intolerances cannot digest certain food components. Adverse food reactions are much more common than food allergies. In food allergies, the body's immune defense system reacts to harmless food components. Food allergies often occur as a cross-reaction with pollen allergies.

Adverse food reactions occur most frequently with dairy products (this is the so-called lactose intolerance), with fructose and with foods that contain histamine such as chocolate, pineapple, nuts or pulses. Gluten, a component of many cereals, also causes difficulties for many people.

Adverse food reactions can occur when the digestive system has not been optimized for the food components it processes.

What adverse food reactions are there?

In the following section, we will introduce the most frequent adverse food reactions and explain how they arise.