Many people already know that grapes are rich in vitamins, antioxidants, and natural plant compounds that may support good health.
Grapes have been linked to benefits for the heart, blood vessels, and immune system for many years. Now scientists are discovering that grapes may also help protect the skin in surprising ways.
Researchers have previously shown that eating grapes can improve the skin’s resistance to ultraviolet radiation, also called UV radiation, in around 30% to 50% of people. UV radiation comes mainly from sunlight and is one of the major causes of skin aging and skin damage. Long-term exposure to UV rays can increase wrinkles, inflammation, and even the risk of skin cancer.
A new study published in ACS Nutrition Science suggests the effects of grapes on skin health may be even broader than scientists first believed.
The research found that eating grapes changed gene activity in the skin of every participant involved in the study. Scientists say this suggests grapes may affect the body at a very deep biological level.
The study involved volunteers who consumed the equivalent of about three servings of whole grapes every day for two weeks. Researchers then examined the participants’ skin before and after grape consumption. They also studied what happened when the skin was exposed to low levels of UV radiation.
Scientists analyzed gene expression in the skin. Gene expression refers to how genes become active and instruct cells to perform different functions. Although everyone carries many genes, not all genes are active at the same time. Food, lifestyle, stress, sunlight, and environmental factors can all influence how genes behave.
At the start of the study, each participant showed a unique pattern of gene activity in their skin. But after eating grapes, researchers observed noticeable changes in these patterns.
The gene activity also shifted after UV exposure, and additional changes appeared when grape consumption and UV exposure were combined.
Even though every person responded somewhat differently, one important result stood out: grape consumption altered skin gene activity in every participant.
Researchers then looked more closely at the biological meaning of these changes.
They found signs that grapes may strengthen the skin’s natural protective barrier. The altered genes were linked to processes called keratinization and cornification.
These are natural processes that help build and maintain the outer layer of the skin. This outer layer acts like a shield, protecting the body from dehydration, environmental pollutants, bacteria, and UV damage.
The scientists also measured levels of a substance called malondialdehyde after exposing skin to UV radiation.
Malondialdehyde is considered a marker of oxidative stress. Oxidative stress happens when harmful molecules called free radicals damage cells and tissues faster than the body can repair them. High oxidative stress is linked to aging, inflammation, and many chronic diseases.
The researchers found that participants who consumed grapes had lower levels of malondialdehyde after UV exposure. This suggests grape consumption may help reduce oxidative stress in the skin.
Scientists believe antioxidants found naturally in grapes may help explain these effects.
Grapes contain many plant compounds, including resveratrol, flavonoids, polyphenols, and vitamin C. These compounds are known for their antioxidant and anti-inflammatory properties.
Antioxidants help neutralize harmful free radicals before they can damage cells. This is why foods rich in antioxidants are often associated with healthier aging and reduced inflammation.
Professor John Pezzuto from Western New England University, one of the researchers involved in the study, described grapes as a “superfood” because of their apparent ability to influence gene activity.
He explained that the study shows grapes may create what scientists call a nutrigenomic response. Nutrigenomics is the study of how food interacts with genes and affects health at the molecular level.
According to Pezzuto, the findings may extend beyond skin health. Researchers suspect grape consumption could also influence gene activity in other parts of the body, including the liver, muscles, kidneys, and brain.
Scientists say modern genomic technologies are now allowing researchers to better understand how whole foods affect the body in complex ways.
The researchers emphasized that this area of science is still developing. More studies are needed to understand exactly how grapes influence gene expression and whether the observed skin changes translate into long-term health benefits.
The study also had limitations. The number of participants was relatively small, and the research only followed people for a short period of time. Scientists still need to determine whether larger groups of people would show the same effects over months or years.
The researchers also did not claim that grapes alone can prevent skin cancer or completely protect against UV damage.
Experts still recommend wearing sunscreen, limiting excessive sun exposure, and practicing other forms of skin protection.
Even so, the findings are exciting because they suggest that simple dietary choices may influence skin health at the genetic level.
Overall, the study presents promising evidence that grapes may support healthier skin by strengthening the skin barrier and reducing oxidative stress caused by UV radiation. The fact that gene activity changed in all participants suggests the effects may be widespread rather than limited to only a small group of people.
However, the research is still early, and larger long-term studies will be needed before scientists fully understand the real-world health benefits. Even so, the findings add to growing evidence that foods rich in antioxidants may influence human health in surprisingly powerful ways.
Source: Western New England University.
