Analysis of PET/CT scans from more than 100,000 people suggests active brown adipose tissue may be associated with protection against several major diseases, although it does not prove a direct cause.
A new Nature study suggests the body’s brown fat may be doing more than helping people keep warm. Researchers analysing PET/CT scans from more than 100,000 patients found that greater brown adipose tissue activity was associated with a lower prevalence of type 2 diabetes, cardiovascular disease and some psychiatric disorders, including depression and anxiety. Nature published the findings on 14 October, describing the work as one of the largest investigations yet into the tissue’s health effects.
The result matters because not all body fat behaves in the same way. White adipose tissue is the familiar energy store that accumulates when calorie intake consistently exceeds expenditure. By contrast, brown adipose tissue burns glucose and fatty acids to generate heat, a process known as thermogenesis. That makes it biologically distinct from the type of fat that contributes to obesity when it becomes excessive.
Brown fat was once thought to be relevant mainly in infancy, when it helps newborns regulate body temperature. Scientists later showed that it remains present and functional in adults, although its activity varies widely from person to person. The latest study, carried out with Memorial Sloan Kettering Cancer Center, used artificial intelligence to comb through imaging data and then compared brown-fat activity with medical records. According to Nature, people with the most active brown fat tended to have better metabolic profiles and fewer related diagnoses.
The findings add to earlier research pointing in the same direction. A Nature Medicine study published in January 2021 found that people with detectable brown fat were less likely to have type 2 diabetes, abnormal blood lipids, coronary artery disease, stroke, heart failure and high blood pressure. Separately, a review in 2013 described brown and beige fat as promising targets for obesity and metabolic disease research, while a 2014 Nature paper showed one pathway by which adenosine can activate brown fat in animal models.
Even so, the new study does not prove that brown fat directly prevents disease. It is retrospective, meaning it looked back at existing records rather than testing an intervention under controlled conditions. That leaves open the possibility that other factors, such as diet, exercise, genetics or medication use, helped shape the results. Still, the scale of the analysis strengthens the case that brown fat is more than a biological curiosity and may eventually become a target for treatments aimed at metabolic and cardiovascular health.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
