> your body will reduce expenditure to match the reduced intake No, it won't. You need about 2000 kcal/d just to maintain body temperature. That's assuming a

> your body will reduce expenditure to match the reduced intake No, it won't. You need about 2000 kcal/d just to maintain body temperature. That's assuming a constant heat output of 100W. A bit less is surely possible, muss less isn't. Reduce food intake below that, and you will lose weight. Because physics.