The Study
No evidence for metabolic adaptation during exercise-related energy compensation
This study showed that when people start exercising, some of them naturally burn less energy than expected — not because their metabolism slows down, but maybe because they move less without realizing it or get better at exercising. It doesn't prove exercise causes this — just that it's linked to it in this group.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When people start exercising, their bodies sometimes secretly burn fewer calories during daily activities to balance things out — like a thermostat adjusting when you turn up the heat.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 561 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This means just adding exercise may not lead to weight loss for many people because their bodies naturally reduce other daily movements to compensate.
- 2Half the people (48%) burned 308 fewer calories per day than expected after exercising for 24 weeks; those who were already more active or fit before starting were most likely to do this.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
iScience
Year
2024
Authors
Flanagan Ew, G. Sanchez‐Delgado, Martin Ck, Ravussin E, P. H, Redman Lm
Related Content
Claims (6)
In sedentary adults with overweight or obesity, changes in how much energy the body compensates for during exercise do not correspond to changes in cholesterol, triglycerides, glucose levels, or inflammatory markers after 24 weeks of aerobic exercise.
In sedentary adults with overweight or obesity, nearly half show a physiological reduction in daily energy expenditure by at least 308 kcal per day after 24 weeks of supervised aerobic exercise, offsetting the energy burned during the workouts.
People who burn more energy throughout the day at rest tend to reduce their total energy expenditure more when they start exercising, compared to those who burn less energy at rest.
After 24 weeks of aerobic exercise, people who reduced their energy intake or increased their energy expenditure to compensate for exercise burned the same amount of energy at rest, during sleep, and over 24 hours as those who did not compensate.
People with higher aerobic fitness levels, measured by maximal oxygen uptake, show a greater reduction in energy expenditure after exercise compared to those with lower fitness levels.
When people intentionally exercise more, their bodies automatically reduce other daily movements and mental energy use to maintain total energy expenditure.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.