New findings show that eating the equivalent of three servings of grapes each day for two weeks can shift gene activity in human skin. The changes appear to strengthen the skin's outer barrier and lower signs of oxidative stress after low-dose ultraviolet exposure.
Volunteers in the study consumed grapes daily for two weeks. Researchers then measured gene expression in their skin before and after the period, both with and without ultraviolet exposure. Patterns of gene activity differed between people and shifted over time, yet grape consumption produced consistent effects across all participants.