研究：防晒霜能延缓皮肤老化_BEC初级作文

研究：防晒霜能延缓皮肤老化

The researchers tracked participants for four and a half years, and used putty-like skin molds to document fine lines and wrinkles. They found that the groups using sunscreen every day showed 24 percent less skin photoaging than those who only applied it periodically. The results were the same regardless of age, so even the middle-aged participants benefited from regular sunscreen use.

"The cost-effectiveness of promoting daily sunscreen use based on skin cancer prevention alone is probably substantially higher after accounting for the additional prevention of skin photoaging," wrote the researchers in their report.

Taking beta-carotene had no overall effect on skin aging, the researchers added.

In 2017, the U.S. Food and Drug Administration decided that sunscreen makers could state on the labels that their products reduced the risk of skin cancer and skin aging if used as directed, as long they also advised people to take other precautions, like reapplying sunscreen at least every two hours (more often if you're sweating or swimming), avoiding going out when the sun is most intense (usually between 10 a.m. and 2 p.m.), and wearing long-sleeved shirts, pants, and broad-brimmed hats to shield the skin when possible.

If you only have a few minutes in the morning, it makes sense to apply sunscreen to the areas most likely to see the sun — your face, neck, and hands. All types of sunscreen, even "sport" or "waterproof" formulas, need to be reapplied regularly, and you should wear sunscreen even if you spend all day driving or working indoors, advises Dr. Jaliman, the cosmetic dermatologist.