[_Algernon_]

200kcal/day is less than 10W. Since all energy the body uses is released as heat this puts the maximum sustainable heat radiation with such a diet at 10W.

That's about the level of a typical household LED, which at most feels slightly warm to the touch.

At that energy level you could not sustain weight while maintaining body temperature let alone having a healthy metabolism. That's just a plain fact.

You will lose weight long before you reach 200kcal/day.

[guerrilla]

That's a good argument against what I said for this particular case. I didn't realize 200kcal was so little. Imagine my comment was written in reply to a higher number though because that criticism is definitely valid for a large number of posts people make in general. ;)