Why exercise alone often fails to produce weight loss—the body compensates.
What the evidence says
- Total energy expenditure plateaus above moderate activity levels — body compensates by reducing energy elsewhere[1]
- Mean energy compensation: 18% ± 93% (massive individual variation)[2]
- Long-term (≈80 weeks) compensation approaches 84%[2]
- Physical activity accounted for only 7% of variation in total energy expenditure after controlling for body size[1]
- Exercise has many health benefits, but weight loss is not reliably one without dietary change[1]