How Long Does Someone Live With Anorexia As Part Of A Healt Project I Need You To Answer This Question About Anorexia.?

As part of a healt project I need you to answer this question about anorexia.? - how long does someone live with anorexia

Under the project a course on health should consider anorexia. A question that is on my side: "If you drink only water, but could not eat, would be how long to survive experiece and physical changes in the body" shut down ", then more or if the question is, how long wilt you live without food?