Experimental Drug Makes Obese Mice Burn Fat Without Losing Muscle – Or Eating Less

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Researchers at the University of California, Berkeley have identified an experimental compound that helps obese mice shed significant weight through a novel mechanism. Unlike conventional weight-loss medications that primarily suppress appetite, the drug—known as TOFA—appears to enhance the body’s natural calorie-burning processes. In a four-week study, obese male mice treated with TOFA twice daily lost approximately 18 percent of their body weight while maintaining their normal eating habits and physical activity levels.

The compound works by simultaneously slowing fat production and increasing the body’s ability to burn stored fat for energy. Notably, the weight loss consisted largely of fat rather than muscle tissue, addressing a common concern with traditional weight-loss approaches. The treatment also produced additional health benefits, including improved blood sugar regulation, reduced insulin levels, and decreased fat accumulation in the liver. When researchers attempted to replicate TOFA’s effects using separate drugs targeting each mechanism independently, the results proved inferior, suggesting the compound’s dual action within a single molecule is essential to its effectiveness.

Researchers discovered that combining lower doses of TOFA with existing appetite-suppressing drugs like semaglutide and tirzepatide produced superior outcomes compared to any single treatment. Because these medications work through complementary pathways—one reducing food intake and the other increasing energy expenditure—the combination addressed multiple aspects of weight management simultaneously. However, significant hurdles remain before TOFA reaches patients, including toxicology testing and human clinical trials to establish safety and optimal dosing.

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Originally reported by Sciencealert →