Omega-3 Fatty Acids as Regulators of Brown Adipose Tissue During Cold Exposure

This study investigates whether omega-3 fatty acid supplementation can increase brown adipose tissue (BAT) activity during cold exposure. Brown fat is a special type of fat tissue that generates heat by burning calories — unlike white fat which just stores energy. In adults, BAT activity declines with age and is lower in people with obesity or metabolic disease. Cold exposure naturally activates BAT, and there is emerging evidence that omega-3 fatty acids (found in fish oil) may enhance this process. If true, this could offer a novel strategy to increase calorie burning and improve metabolic health. To be eligible, participants must be adults aged 18 to 40 with a healthy BMI (18.5–24.9), be moderately to highly active, and not have any significant medical conditions (cardiovascular disease, diabetes, renal disease, metabolic disorders, etc.). People who regularly consume fish oil or eat more than one fish meal per week, have bleeding disorders, take SSRIs, or have a resting blood pressure above 130/90 are excluded. Participants are randomized to receive omega-3 supplements or a placebo, then undergo controlled cold exposure sessions. Researchers measure BAT activity (using imaging) and metabolic rate before and after the intervention. This research matters because finding safe, accessible ways to activate BAT could provide a new approach to combating obesity and metabolic syndrome — without the side effects of drugs — and omega-3 supplementation is already widely used and well-tolerated.