If someone had an eating disorder. Say a female, 5'5 and 18 years old. How long could they live on 700 calories a day ? If they didn't do extreme exercises. And started out at a normal weight of 125. How long before they died ? Mindy D.
Others, like Karen Carpenter (a famous singer in the 1970s), died of a heart attack thought to be caused by a deficiency of potassium (possibly from laxative abuse). Without essential electrolytes in the blood--which come from minerals in the diet--there is danger of halting neurotransmissions, one of which is the signal to the heart to beat.
It's a terrible, drawn out way to die.