A doctor may decide to supplement your diet with nutrients administered through an IV if your loss of appetite has led to malnutrition. Your doctor may recommend an hunger-stimulating pill to take orally. You may also be referred to a mental health professional or coach if it’s suspected that you having no hunger is due to mental health issues such as depression, an eating problem, or substance abuse. Modifying your medicine's dose or switching to a different drug may help restore your appetite if it has been lost as a side effect. You should never adjust your prescription regimen without discussing it with your doctor.