The naturally-occurring antioxidants in grapes may help reduce risk factors for cardiovascular disease and metabolic syndrome, according to new research from the University of Michigan Health System.

Researchers studied the effect of regular table grapes that were mixed into a powdered form and integrated into the diets of laboratory rats as part of a high-fat, American style diet. They found that after three months, animals that consumed a grape-enriched diet had lower blood pressure, better heart function, and reduced indicators of inflammation in the heart and the blood than rats who received no grape powder. Rats also had lower triglycerides and improved glucose tolerance.

"Although there’s not a particular direct correlation between this study and what humans should do, it’s very interesting to postulate that a diet higher in phytochemical-rich fruits, such as grapes, may benefit humans," said lead researcher Dr. Steven Bolling.

Metabolic syndrome is a condition with a cluster of characteristics including excess belly fat, high triglycerides, high blood pressure, reduced glucose tolerance, and elevated c-reactive protein. It affects an estimated 50 million Americans.

Those with metabolic syndrome are at higher risk for cardiovascular disease and type 2 diabetes.

Healthcare experts say the best ways to avoid these risk factors are to eat a healthy diet, achieve a desirable weight and increase physical activity.