The Summary
Researchers pooled data from two clinical trials involving 73 healthy adults experiencing weight changes ranging from losing 11 kg to gaining 7 kg. Participants underwent either calorie-restriction protocols or deliberate overfeeding. The study revealed that circulating levels of endotrophin—a signaling molecule linked to tissue scarring—dynamically rose with fat gain and dropped with fat loss. Furthermore, statistical mediation analysis demonstrated that endotrophin accounted for roughly 15% of the direct effect that changes in body fat had on circulating total cholesterol levels.
Why this is interesting
Endotrophin was previously known from animal studies as a driver of metabolic dysfunction and inflammation during sustained obesity, but its short-term behavior in humans was unclear. This study reveals that circulating endotrophin reacts rapidly to changes in body fat. By partially mediating the link between adiposity and blood cholesterol, endotrophin emerges as an active molecular link between body composition and cardiovascular risk. For everyday health, this shows that even modest fat loss immediately lowers a potentially harmful signaling molecule, offering a clearer picture of how trimming body fat protects our arteries.