Researchers randomly selected sixty 40- to 65-year-old women to drink a tea beverage with polyphenols—the healthful nutrients found in green tea—or a green tea–like beverage without polyphenols, for 12 weeks. Neither the participants nor the researchers knew which women were selected to drink which version of the tea.
All of the women in the study had type II skin on the Fitzpatrick phototyping scale. On this scale, type II skin is characterized by light to normal ultraviolet light (UV) sensitivity, and generally includes people of middle European skin type, with blond or light brown hair.
The women were exposed to a solar simulator, a UV lamp that can cause sunburn and tanning, at the start of the study and 6 and 12 weeks later. Skin color was measured before, and 24 hours after, solar simulator exposure. The amount of exposure was 1.25 times the minimal erythema dose—or 1.25 times the smallest amount of sun exposure that leads to a slight reddening of the skin. The researchers collected other measures of skin health, including elasticity, roughness, scaling, skin density, and delivery of blood and oxygen to the skin.
Compared with women drinking the beverage without polyphenols, the women who drank the polyphenol-rich green tea beverage had
This study suggests that green tea polyphenols can protect skin against harmful UV radiation and improve skin quality of women with fair to moderate skin pigmentation. Use our tips to work more green tea into your summer sipping plan:
(J Nutr 2011;141:1202–8)