Brown Adipose Tissue

Unlike regular white fat that stores energy, brown fat burns calories to generate body heat — think of it as your body’s internal furnace. Adults have small amounts of brown fat, mainly around the neck and shoulders, and its activity is linked to a healthier metabolism and lower body weight.

Brown adipose tissue (BAT) is a thermogenic tissue characterised by multilocular adipocytes with abundant mitochondria expressing uncoupling protein 1 (UCP1). UCP1 uncouples oxidative phosphorylation, dissipating the proton gradient as heat rather than ATP synthesis. BAT activity is regulated by sympathetic nervous system input via β3-adrenergic receptors and is inversely correlated with BMI and adiposity in humans.

Research into BAT activation represents a promising therapeutic frontier for obesity treatment. While pharmacological BAT activators are still under investigation, strategies including cold exposure and certain dietary compounds are being studied for their potential to increase energy expenditure naturally.