More and more people are complaining about nutritional problems. There are tons of theories about what they are caused in the media. Many of them are mutually exclusive. Once we hear that we should switch to vegetarianism, another time that meat is essential in the diet of every human being. Every now and then new diets are promoted, which are supposed to make us healthy - and these are adapted to the blood type, and also to other factors. The truth is, there is no one-size-fits-all diet. Only doing allergy tests or all kinds of intolerances will not help us, because the most common cause of our food problems does not lie in allergies, but in inadequate nutrition.