GLP-1 drug tirzepatide may boost calorie-burning brown fat

Tirzepatide (sold as Zepbound/Mounjaro) may boost brown fat activity — so it might not just curb appetite but also increase calorie burning.
In a 24-week study of obese premenopausal women, imaging showed detectable brown fat activity rose from about 41% to nearly 65% of participants.
Brown fat, which burns calories to produce heat and was once thought absent in adults, could help explain why GLP-1 drugs affect weight beyond eating less.