Oh for sure, if your physical activity is higher you need to eat commensurately more! What I meant is, for most of us with desk jobs and little physical activity, our bodies need surprisingly little food and this is what fasting reveals.

Like even on OMAD I pretty much don't lose any weight (and no, I'm not as lean as I wish I were!) I strongly suspect if average, healthy people cut out an entire meal a day and changed nothing else, their bodies would stay mostly the same.