Why your calorie target stops working after two months

You set 1,800 calories, lost weight steadily for eight weeks, and then it stopped — same food, same training, no movement on the scale. This is not a metabolic mystery. Three things are happening at once, and all three are predictable.

First, a smaller body burns less. Energy expenditure scales with mass, so after losing 7 kg your maintenance requirement has fallen by roughly 100–150 kcal a day. The deficit you set against your original TDEE has quietly shrunk by a quarter or more.

Second, spontaneous movement drops. In a sustained deficit people fidget less, walk slower and sit more, without noticing. This non-exercise component can account for several hundred calories a day and is the single largest source of stall.

Third, tracking drifts. Portion estimates creep upward over weeks, cooking oil goes uncounted, and weekend meals get logged optimistically. Studies consistently find people under-report intake by 20–30% once the novelty of tracking fades.

The fixes, in order of preference. Recalculate TDEE at your current weight and reset the target — this alone often restores progress. Add movement rather than subtracting food: 2,000 more steps a day is roughly 80–100 kcal and costs nothing in hunger. And re-weigh your food strictly for one week to recalibrate your eye.

If you have been in a deficit for more than about twelve weeks, a planned two-week break at maintenance is worth more than another cut. It restores adherence, returns spontaneous activity, and makes the next phase work. Diets do not fail because the arithmetic is wrong; they fail because the arithmetic keeps moving and nobody updates it.