It's not that anorexics don’t eat at all, they do EAT! Anorexia is a kind of mental state that compels you to starve yourself to get thinner but not starving 100% of the time. They usually avoid breakfasts and just prefer eating once in a complete day but they might seldom go for a breakfast that includes just an apple or some other fruit. Everyone eats a different amount of calories, but usually below the daily necessity. They usually take calories around 500 to 600 and the ones in an extreme case can reduce it to 50 to 100 calories.