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Eating Habits Affect Skin's Protection Against Sun
USAgNet - 08/17/2017

Sunbathers may want to avoid midnight snacks before catching some rays. A study in mice from the O'Donnell Brain Institute and UC Irvine shows that eating at abnormal times disrupts the biological clock of the skin, including the daytime potency of an enzyme that protects against the sun's harmful ultraviolet radiation.

Although further research is needed, the finding indicates that people who eat late at night may be more vulnerable to sunburn and longer-term effects such as skin aging and skin cancer, said Dr. Joseph S. Takahashi, Chairman of Neuroscience at UT Southwestern Medical Center's Peter O'Donnell Jr. Brain Institute.

"This finding is surprising. I did not think the skin was paying attention to when we are eating," said Dr. Takahashi, also an Investigator with the Howard Hughes Medical Institute.

The study showed that mice given food only during the day -- an abnormal eating time for the otherwise nocturnal animals -- sustained more skin damage when exposed to ultraviolet B (UVB) light during the day than during the night. This outcome occurred, at least in part, because an enzyme that repairs UV-damaged skin -- xeroderma pigmentosum group A (XPA) -- shifted its daily cycle to be less active in the day.

Mice that fed only during their usual evening times did not show altered XPA cycles and were less susceptible to daytime UV rays.

Previous studies have demonstrated strong roles for the body's circadian rhythms in skin biology. However, little had been understood about what controls the skin's daily clock.


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