A 2011 study on mice at the University of North Carolina at Chapel Hill showed a link between tanning early in the day and a decrease in skin cancer. Due to the results, researchers on the project believe humans have the highest rate of DNA repair before noon.
A higher rate of DNA repair can decrease the chance of harmful UV radiation having a carcinogenic effect on skin. Long-term exposure to large amounts of UV radiation has been linked to skin cancer and premature skin-aging. Harvard Medical School recommends avoiding tanning beds and sunbathing only as necessary. However, young women continue to use indoor tanning beds frequently, despite understanding the dangers. As of 2014, the group most at risk for developing skin cancer are those under the age of 35.