In the study, people with early memory decline were selected to receive either a whole grape powder, which was equivalent to just a little over two cups of grapes daily, or a polyphenol-free placebo powder. Six months later, changes in the brain metabolism were assessed by brain scans and cognitive performance were measured. The results showed that people consuming grapes preserved healthy metabolic activity in the regions of the brain that are affected by the earliest stages of Alzheimer’s disease. Participants who did not consume grapes had a significant metabolic decline in these critical regions.
Previous researches had also shown that eating grapes may also help enhance brain health by prompting healthy blood flow and reducing oxidative stress in the brain.