Answer one: If you're talking per meal, it depends on how many meals you have a day.3 meals = 1200 calories per day. You should probably have a couple snacks in-between meals because 1200 cal. is not very healthy for your metabolism. You should have probably 1300-1350 calories a day.
Answer two: Don't even think about only eating 400 calories a day. That's the impression I'm getting from your question and that's just insane. Your body goes into starvation mode if it gets less then 1 200 calories a day.It storing the fat that it gets because your body knows it's not going to get any more for a while. Just a fun fact for you; prisoners in the Holocaust got 500 calories a day in the concentration camps (or atleast that's what I heard). You will eventually die if you only eat 400 calories so please don't try it. That's not even a quarter of what you should be getting. Stay safe!
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