Protein Intake Stalled My Weight Loss — I Was Using the Wrong TDEE Input

My client James (34, male, 5'11") was stuck at 192 lbs for three weeks despite hitting 180g protein daily and logging every meal. He assumed his metabolism had "adapted" and asked about a diet break.

I pulled up his TDEE calculation in our tracker. He'd been using his goal weight (185 lbs) as the input instead of his actual weight (192 lbs). That 7-pound difference meant his TDEE was underestimated by 210 calories/day.

Here's the math:

• Mifflin-St Jeor BMR at 185 lbs, moderate activity: 2,480 cal/day
• Mifflin-St Jeor BMR at 192 lbs, moderate activity: 2,690 cal/day
• Difference: 210 cal/day × 21 days = 4,410 cal = ~1.3 lbs of fat not lost

We recalculated his TDEE at his actual weight (2,690), set his intake to 2,190 (500-calorie deficit), and kept protein at 180g. Seven days later, he dropped 1.8 lbs. Not metabolic adaptation — just a spreadsheet error.

The lesson: always use your current weight for TDEE, not your goal weight. If you're within 10 lbs of your goal, the difference is small. But at 50+ lbs away, the error compounds fast.

Our TDEE calculator now defaults to actual weight and flags if you try to override with a goal weight more than 15 lbs different.

— Dr. Kim