New research suggests grapes may offer surprising benefits for skin health by changing how genes behave in the body. Earlier clinical trials showed that eating grapes could improve resistance to UV radiation in about 30% to 50% of people. Now, scientists say the effects appear to be much broader and may influence nearly everyone in some way.
In the study, volunteers ate the equivalent of three servings of whole grapes each day for two weeks. Researchers then examined gene expression in the participants’ skin before and after grape consumption, both with and without exposure to low levels of UV radiation.
Grapes Trigger Changes in Skin Gene Expression
The researchers discovered that every participant had a distinct pattern of gene activity in their skin at the start of the study. Those patterns shifted after eating grapes and also changed following UV exposure.
Additional differences appeared when grape consumption and UV exposure were combined. Although the responses varied from person to person, scientists found that grape consumption altered gene expression in all participants.
The results suggest grapes may influence biological pathways connected to skin protection and repair.
Stronger Skin Barrier and Reduced Oxidative Stress
When the researchers analyzed the large amount of genetic data, they found evidence pointing to increased keratinization and cornification. These processes help create the skin’s outer protective barrier and can improve defense against environmental stress.
The team also exposed skin to low doses of UV radiation and measured malondialdehyde, a marker associated with oxidative stress. Participants who consumed grapes showed lower levels of this marker, suggesting reduced oxidative stress after UV exposure.
