Read the BMJ Study (Ebbeling et al. 2018)
https://pubmed.ncbi.nlm.nih.gov/30429127/
- Journal: BMJ (2018; 363:k4583)
- DOI: 10.1136/bmj.k4583
- PMID: 30429127 (often cited alongside 30429126 in summaries)
- Total Energy Expenditure (TEE):
- Low-carb group burned ~200–250 kcal/day more than the high-carb group during maintenance.
- In participants with high insulin secretion, the difference was larger (~300–400 kcal/day).
- No major differences in reported hunger or satiety between groups under controlled conditions.
- Suggests diet composition may affect energy expenditure after weight loss, potentially making maintenance easier on lower-carb diets
This study addresses a question that should have been settled long ago: whether the body treats all calories the same. Under controlled conditions, participants who reduced carbohydrates burned more energy than those consuming higher-carbohydrate diets, even while maintaining the same weight.
The finding is not subtle. Energy expenditure increased in a clear, stepwise fashion as carbohydrates were reduced, with the largest effect seen in those with higher insulin response.
This points to something deeper than diet preference. The body is not a simple accounting system. Hormonal signaling, particularly insulin, appears to influence how energy is used, stored, and sustained after weight loss.
The implication is straightforward. If metabolic response differs based on diet composition, then the long-standing public guidance built on “calories in, calories out” is incomplete at best. At minimum, it requires correction. At most, it requires rethinking the foundation.