Maintenance calories

Maintenance calories are the intake at which body weight holds steady — intake matching expenditure. It is the reference point a deficit or surplus is measured from, not a separate goal, and it moves as weight and activity move.

Maintenance calories are the intake at which body weight holds steady: energy in matching energy out. Everything else is defined relative to it — a deficit is eating below it, a surplus is eating above it.

It is closely related to TDEE but arrived at from the other direction. TDEE is a calculated estimate of what the body spent. Maintenance is the observed intake that turned out to hold weight flat. When a calculator’s TDEE estimate and several weeks of real logged intake disagree, the logged number is the one describing this particular body.

The part that catches people is that maintenance is not fixed. It falls as bodyweight falls, because a lighter body costs less to move and less to keep warm. It falls further if activity quietly drops — fewer steps, shorter sessions — which is a normal response to eating less rather than a failure of discipline. A deficit set once against an old maintenance figure therefore shrinks toward zero on its own, and that is one of the ordinary mechanisms behind a plateau.

There is also a deliberate use for eating at maintenance rather than passing through it: holding weight steady while training is the intake range body recomposition needs, and a planned stretch at maintenance after a long deficit is how many people break a cycle of losing and regaining.