Vegetarianism in its various forms, is widely encountered in different societies all over the world; thus, combining nutritional, social, behavioral and psychological aspects. The prevalence of vegetarianism in the western world, as well as in Israel, is dealt with in this review. The extent of vegetarianism among young patients with eating disorders is much higher than in any other age group. Anorexia nervosa patients in Israel admit to be vegetarians in 85% (mean), as compared to 65% (mean) in other western countries.