(FN) - A substance found in red wine and dark chocolate that has been touted for its supposed anti-aging effects may improve people's memory, new research suggests.

In a study of overweight adults, those who took resveratrol supplements for six months had better short-term recall than their counterparts who took a placebo. The people who took the supplement also had more connections among brain areas involved in memory, and this paralleled improvements over the study period in their ability to break down sugar in the body, researchers found.

This small pilot study, detailed Wednesday (June 4) in the Journal of Neuroscience, is the first to show a link between the red wine compound and cognition in overweight adults, said Veronica Witte, a neuroscientist at the Charit UniversittsmedizinBerlin in Germany. [6 Foods That Are Good for Your Brain]

"From a clinical point of view, our findings suggest that regular, high-level intake of resveratrol in the elderly may convey protective effects on cognitive functions, a hypothesis that now needs to be evaluated in large-scale clinical trials," Witte told Live Science.

Brain booster?

Aside from red wine and dark chocolate, sources of resveratrol include red grapes, peanuts, blueberries and Japanese knotweed. Doctors think the compound mimics the effects of a restricted-calorie diet on the body.

Some studies have linked resveratrol to benefits in aging, heart health and anti-cancer effects. But other studies suggest the compound has no effect on longevity. Few studies have investigated resveratrol's effects on cognition, and those that have done so investigated nonhuman primates, the researchers said.