Models will need to provide a doctor's certificate attesting to their overall physical health, with special regard to their body mass index (BMI) - a measure of weight in relation to height.
The health ministry says the aim is to fight eating disorders and inaccessible ideals of beauty.
Digitally altered photos will also have to be labelled from 1 October.
Images where a model's appearance has been manipulated will need to be marked photographie retouchée (English: retouched photograph).
