[Relationship between nutrition and tumor formation].

The tumours of man mainly develop under the influence of the long-term intake of carcinogens and cocarcinogens. There is a correlation between the level of the intake of meat and the development of tumours of the colon and the mamma. In vegetarians these forms of tumours very rarely appear. For their prevention it is necessary to decrease the consumption of sorts of meat and sausage rich in fat, so that less than 50 g of animal fat are taken in a day. It is to be recommended an increase of the consumption of food-stuffs rich in raw fibers. The caretenes, the vitamin A and the vitamin-A-acid proved as anticarcinogens. In smokers an intake of carotene and vitamin A which overwhelms the need is useful. With smoked food-stuffs in small quantities benzpyrene and nitrosamines are taken in, a restriction of the consumption of smoked meat and fish is not to be recommended. a carcinogenic effect have also aflatoxines, for which purpose no food-stuffs infested by fungi must be taken in.