On the surface bud, it is that simple for the 90% of people.
I understand an agree with what you are saying (Protein,Fat,Carbs). But for the vast majority less in than you burn is simply all that is needed.
Any fire with less fuel than it needs will cannibalise itself (and burn out).
Someone like yourself, on the dietary educated side, may watch their macros whilst doing such a reduction. For the main stay, the reduction is more beneficial than the macros!
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