In schools where lunch is offered, as part of the organizational possibilities, the requirements for special foods and diets or allergies of children are taking in consideration. Increasingly, attention is paid to organic foods.
If there are certain needs for your child, you might be asked to provide the food needed. Please note that the teaching staff is not permitted to supervise the medical treatment of a child.
For details see https://www.mk.niedersachsen.de/startseite/schule/schuelerinnen_und_schueler_eltern/gesundheitsfoerderung_praevention/schule_und_ernaehrung/schulverpflegung/schulverpflegung-95722.html