Blueberry Compound Helps Muscles Burn Fat Stores

New research points to a natural chemical hidden inside blueberries and grapes that might help muscle cells burn stored fat. Scientists working in Japan discovered this compound, known as pterostilbene, cuts down on fat buildup when they tested it on mouse muscle cells grown in a lab. Pterostilbene is an antioxidant common in berries like blueberries and grapes. Experts knew it offered metabolic perks before, but how it specifically acted on skeletal muscle remained a mystery until now.

The study, which hit the pages of Food Bioscience on Sept. 1, shows pterostilbene stops abnormal fat accumulation by pushing cells to break down existing stores. This buildup often stems from eating too much fat, sitting still, or simply getting older. When muscles pack on excess internal fat, they struggle to use glucose and fatty acids properly, a process that can fuel insulin resistance.

"Our findings establish a scientific framework for developing functional foods and nutritional supplements that target muscle fat metabolism," said Takakazu Mitani, an associate professor at Shinshu University who led the work. His team sifted through various food-derived compounds and found pterostilbene triggered the biggest drop in fat without hurting muscle growth. The chemical seemed to keep a protein called PPAR-delta intact, the key regulator for how cells handle fat.

This research offers an "experimental framework" for hunting other natural substances that protect PPAR-delta, Mitani noted. The results give scientists a foothold for exploring diets that might tackle obesity, type 2 diabetes, and metabolic decline linked to aging. But more work lies ahead before anyone can claim this works in living people or animals.

Using a cell model "strips away the complexity of human metabolism," Johannah Katz, a registered dietitian from Florida, told Fox News Digital. She explained that for pterostilbene to help humans, it must pass through digestion, enter the bloodstream, and reach muscle tissue at an effective dose. Mouse cells do not always react exactly like human ones.

"While the study identified a potential mechanism that may help explain reduced fat accumulation in cells, that is different from showing that eating blueberries or taking pterostilbene supplements directly leads to fat loss," Katz added. Blueberries and grapes remain nutritious for many reasons, yet this single study does not prove that eating more of them will slash fat buildup in human muscle. Fox News Digital asked the study authors for comment.