https://www.bmj.com/content/363/bmj.k4583
This study examines a question that has been debated for decades: whether all calories function the same in the body. Under tightly controlled conditions, participants who reduced carbohydrates burned significantly more calories than those on higher-carbohydrate diets, even while maintaining the same weight.
The implication is straightforward. Metabolism is not simply a matter of willpower or calorie counting. The composition of the diet, especially the level of carbohydrates, appears to influence how the body partitions energy, regulates hormones, and sustains weight loss over time.
For those trying to maintain weight loss, this matters. The study suggests that lowering carbohydrates may help counter the metabolic slowdown that often follows dieting, allowing the body to burn more energy without increasing intake.
At a deeper level, this challenges a long-standing assumption in modern nutrition. If different foods produce different metabolic effects, then the guidance given to the public over the past several decades deserves closer examination.