Fashion models in France will have to show they are a healthy weight to end the "glorification of anorexia".
Under a new law, they will need a doctor's certificate to stop super-skinny models working in advertising or on the catwalk.
Magazines must also label any images which have used computer technology to change a model's shape.
Fashion bosses and models face a six-month prison sentence or fines of up to £50,000 for featuring underweight women.
MPs have ruled that doctors must decide if a model is healthy by taking into account her age, gender and body shape. If satisfied she is not too thin, they will issue the medical certificate.