A small clinical trial found that eating the equivalent of three servings of grapes daily for two weeks reduced a marker of UV-related skin damage and appeared to influence genes tied to skin barrier strength.
By yourNEWS Media Newsroom
Daily grape consumption may help reduce certain markers of ultraviolet-related skin damage, according to a clinical trial published in ACS Nutrition Science.
The study, funded by the California Table Grape Commission, examined whether compounds in grapes could affect the skin at the molecular level. Researchers analyzed 116 skin biopsies from 29 volunteers who consumed 70 grams of freeze-dried grape powder each day for two weeks, an amount equal to about three servings of fresh grapes, according to a Mercola.com article.
The researchers took biopsies from both UV-exposed and non-exposed skin before and after the two-week grape intervention. Each participant provided four biopsy samples, allowing the research team to examine tissue-level changes linked to UV exposure, oxidative stress, skin barrier function and gene activity.
After the grape intake period, participants showed lower levels of malondialdehyde, or MDA, a byproduct associated with UV-induced cell membrane damage. The reduction was observed across the participant group, including among four volunteers who did not show visible improvement in UV resistance under standard clinical measurements.
That finding suggested that grape intake may have produced protective changes below the skin’s surface, even when those changes were not visible through conventional UV-resistance testing.
The study also indicated that grapes may affect the body through more than direct antioxidant activity. Researchers reported changes in gene activity related to keratinization and cornification, two processes involved in strengthening the skin’s outer layer. That outer barrier helps protect against ultraviolet radiation, environmental chemicals and water loss.
According to the researchers, the study was the first reported instance of grape consumption changing gene activity in human tissue outside blood cells.
The findings build on earlier work from the same research group showing that grape consumption altered the gut microbiome and the body’s chemical profile. In the new phase, researchers examined whether those changes might connect to the skin through what is known as the gut-skin axis.
The gut-skin axis refers to communication between the digestive system and the skin. Researchers hypothesize that compounds in grapes interact with gut microbes, which then transform those compounds into molecules that circulate through the body and affect skin gene expression.
Flavonoids in grapes, known for antioxidant properties, may play a role in that process. Grapes also contain natural compounds such as resveratrol, which has been associated in nutritional research with cardiovascular and anti-aging benefits.
The study also found changes in blood fat profiles among four participants whose samples were analyzed before and after the grape intervention. Researchers observed increases in phosphatidylserine and phosphatidyl choline, fats associated in oral and topical preparations with skin barrier function and anti-inflammatory effects.
The report also found that saturated fatty acids decreased while unsaturated fatty acids increased. According to the study findings, that pattern could potentially help reduce circulating low-density lipoprotein, or LDL cholesterol.
The lipid changes appeared consistent across the four participants despite individual differences. Researchers said more study is needed to fully understand the significance of those shifts, but the findings align with known roles of certain fats in supporting skin health and inflammation control.
The trial adds to evidence that diet may influence skin health at the molecular level. However, the findings come with important limits. The study was small, involved 29 volunteers and used the equivalent of three servings of grapes per day, an intake level that may be higher than what many people typically consume. The research also was funded by the California Table Grape Commission.
The findings do not mean grapes can replace standard sun protection. Experts cited in the report emphasized that sunscreen remains essential for protecting skin from UV damage.
Still, the study suggests that whole fruits such as grapes may support skin resilience when combined with other sun-safe habits. Eating whole grapes, including the seeds, may provide additional phytonutrients, according to some nutritional sources.
Researchers said further work is needed to determine how grape compounds, gut microbes, blood fats and skin gene activity interact. For now, the trial points to a possible connection between daily grape intake and reduced molecular signs of UV-related skin stress.
Source: Natural News
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