(CNN) -- After learning that Ashton Kutcher had landed in the hospital trying to follow Steve Jobs' all-fruit diet, CNN reader Sumday had just one question: "All I really wanted to know was why this diet was bad?"
Even if you don't overwork your pancreas, you're probably not eating enough calories on an all-fruit diet, Moore says. That puts the body into starvation mode, which can result in serious medical conditions like osteoporosis, severe dehydration and even heart failure, according to the National Eating Disorders Association.