Why did my weight loss stop?

Mostly because you’re smaller. Each pound you lose lowers your daily burn by about 10 calories, so after 20 pounds your old target has lost about 200 calories of its deficit. Add a little drift in portions and logging, and the gap closes. It’s normal, and the fix is simple: measure your new maintenance and reset your target from it.

When the scale stalls after months of progress, it feels like your body has started fighting back. A little of that is real. Most of it is arithmetic.

The simple version

Your calorie target was sized for the body you had when you set it. Lose 20 pounds and it’s sized for someone else, someone bigger.

Where the deficit went

• A smaller body. NIH scientists built a model of weight change whose rule of thumb is that every 10 calories a day you cut for good takes off about a pound in the end. Turned around, each pound lost lowers your burn by about 10 calories a day.
• A small extra dip. Dieting lowers your resting burn a little beyond what size explains. In a 2020 study, 71 people with obesity ate 1,000 calories a day for 8 weeks and lost about 30 pounds. Their resting burn ended about 90 calories a day below what their new size explained. After four weeks at a steady weight the gap was about 40, and in the 45 people measured throughout it was gone at one year.
• Drift. Portions creep and logs get looser over months. In a 2003 study of 484 adults, even a careful 24-hour food recall under-reported calories by 12 to 20%.

What to do

• Measure your current maintenance: four weeks of logged meals and morning weigh-ins on the real TDEE calculator.
• Reset your target about 500 under the new number, never under your resting burn, 1,200 a day for women or 1,500 for men.
• After many months of dieting, a few weeks at your new maintenance is a fair choice before cutting again.