10,000 Steps a Day, No Weight Loss — The Exercise Calorie Compensation Trap

Rachel, 38, came to my clinic frustrated. She'd been hitting 10,000 steps daily for six weeks, tracking her food in MyFitnessPal, and her weight hadn't budged. She was wearing a Garmin Venu 3 and eating back the calories it said she burned.

Her Garmin estimated 400-500 calories burned from steps per day. She was eating 300-400 of those back as "post-walk snacks." A banana here, a protein bar there. The problem: fitness trackers overestimate calorie burn by 20-50% depending on the activity.

I asked her to stop eating back any exercise calories for two weeks. Keep the 10k steps, keep the same food log, but treat the walk as movement, not a license to eat more.

Result after 14 days: she lost 1.5 lbs. The only change was removing the 300-400 calories of "earned" snacks. That's about 2,450-4,900 calories per week removed — exactly enough to drive a 1.5 lb loss.

The lesson: unless you're doing marathon training or heavy strength work, the calories you burn from daily walking are already factored into your TDEE. Eating them back directly undermines your deficit. The tracker is a step counter, not a calorie bank.

— Dr. Kim