Veganism is a form of nutrition that is becoming increasingly popular. There is also a pandemic-related increase in mental illness, which often manifests itself in the form of an eating disorder among children and adolescents. Particularly challenging in nutritional therapy is anorexia nervosa in combination with veganism.There is consensus that a correctly implemented vegan diet can generally cover the daily nutritional requirements. However, this does not apply to people who are in a growth period. Therefore, this article attempts to highlight the special requirements of a vegan diet along the dietary process development.The basis is provided by a specific anamnesis as well as the elicitation of nutritional status by means of nutrition protocol and bioelectrical impedance analysis. The treatment and goal setting are influenced by the motives behind a vegan diet and further diagnoses such as orthorexia or food intolerance. Regarding the course of action, it must be clarified how an adequate vegan diet can be guaranteed and which conditions are needed to create a space where different diets can be accepted simultaneously. Withing the daily care, nutritional aspects such as the reduction of anorexia-related digestive complaints as well as the selection, quantity and preparation of vegan foods are foregrounded. This is illustrated by nutritional analyses. The objective is to achieve a high level of compliance and to ensure a sufficient nutrient supply in order to make food, as well as vegan food, enjoyable.