I want to help my friend she only takes bite from in apple for breakfast and doesn't eat lunch and barely eats dinner what could happen to her?

Eating disorder?: Does she think she's overweight? She may have an eating disorder that requires working with a doc & therapist. With such little food intake, she is losing lean muscle mass as well as fat. Does she complain of stomach pain when she eats? She might have an ulcer or other condition that needs to be evaluated. Encourage her to see a doc asap.

NothingBeneficial: Extreme , improper eating habits ? For weight reduction can lead to a damaged metabolism, as-well-as immune problems, fatigue, protein malnutrition ..And on! the more serious disorder: anorexia nervosa may be the cause. Thinning of the heart muscle, electrolyte disturbances have occurred with subsequent death! a well-known singer, died from this. If habitual , get her help! in the interim-mtv's.

She could die: You are right to be concerned. It sounds like your friend has anorexia nervosa, a serious condition that could be fatal. She needs professional help and might even require hospitalization. It may be difficult to convince her to get help. Discuss your concerns with her family, as they should help her. See www.Helpguide.Org/mental/anorexia_signs_symptoms_causes_treatment.Htm for more information.