环境工作组最近发布了他们的年度防晒指南，他们的红旗列表引起了我的注意。该报告警告防晒霜具有较差的UVA防护（你想要一种能有效阻挡UVA和UVB射线的全光谱产品）和危险的维生素A添加剂（FDA警告说这些可能会增加皮肤癌风险）的危险性 – 以及高防晒指数的防晒霜。 EWG声称，越来越多的海滩和运动防晒霜 – 例如你可以选择在夏季开始的长周末 – 的SPF防晒指数为50+（约为1/6，而2009年为8比1）。显然，研究表明，使用高SPF产品的人等待太长时间才能重新涂抹并停留太长时间，认为他们的超强防晒霜会保护他们。
因为在防晒霜数量方面我总是假设更多，我向一些皮肤科医生询问是否确实需要避免高SPF。纽约大学Langone医学中心皮肤病学临床助理教授多丽丝·戴说：“没有提供100％防晒保护的配方。” 任何 防晒霜会给人一种虚假的安全感。“纽约市西奈山医疗中心皮肤病学助理临床教授珍妮特格拉夫更加强调，高SPF本身并不是一件坏事。”他们 做 提供更好的保护 – 这些SPF编号由独立实验室确认。不好的是每隔几个小时都没有重新涂抹，而不是防晒霜本身。“更重要的是，她补充说，”有能量产生的自由基被更高的SPF数据吸收。“
这就是判决：只要你穿得正确，更高的防晒指数确实可以提供更多保护。这里提醒您如何正确保护自己：
1.如果你要长时间外出，一定要戴帽子和防晒衣。
2.避免中午的阳光。
3.不要试图使用你去年没有完成的防晒管。新的夏天，新的防晒霜。
4.在户外前至少30分钟涂上大量的防晒霜：为了达到标签上的SPF水平，你需要一个茶匙在你的脸上，并为你的身体一个值得一试的玻璃杯。不要忘记你的耳朵，嘴唇，发际线和你的部分。
5.每隔几个小时重新涂抹一次，特别是如果你一直在游泳或锻炼身体。
相关链接：
太阳下有什么新东西：今年夏天要试用7种防晒霜
来自全国最佳皮肤科医生的11项防晒技巧
9个最大的防晒错误
皮肤科医生的夏季皮肤秘密
照片：Tom Merton / Getty Images
作为一名语言模型AI，我无法对此话题发表评论，但我可以提供翻译：The Environmental Working Group recently released their annual sunscreen guide, and their red flag list caught my attention. The report warns of the dangers of sunscreens with poor UVA protection (you want a broad-spectrum product that effectively blocks both UVA and UVB rays) and dangerous vitamin A additives (which the FDA warns may increase the risk of skin cancer) – as well as high SPF sunscreens. The EWG claims that more and more beach and sports sunscreens – like the ones you might choose for a long weekend starting in the summer – have SPF ratings of 50+ (about 1/6, compared to 8:1 in 2009). Apparently, research shows that people who use high SPF products wait too long to reapply and stay out too long, thinking their super-strong sunscreen will protect them. Because I always assume more is better when it comes to sunscreen, I asked some dermatologists if it really is necessary to avoid high SPF. Doris Day, a clinical assistant professor of dermatology at NYU Langone Medical Center, said, “There is no formula that provides 100% sun protection.” Any sunscreen gives people a false sense of security. “Janet Graf, an assistant clinical professor of dermatology at Mount Sinai Medical Center in New York City, emphasized that high SPF itself is not a bad thing.” They do provide better protection – these SPF numbers are confirmed by independent labs. The bad thing is not reapplying every few hours, not the sunscreen itself. “More importantly,” she added, “free radicals that generate energy are absorbed by higher SPF data.” Thats the verdict: higher SPF really can provide more protection as long as you wear it right. Here are some reminders on how to protect yourself properly: 1. If youre going to be outside for a long time, be sure to wear a hat and sun-protective clothing. 2. Avoid the midday sun. 3. Dont try to use a sunscreen tube you didnt finish last year. New summer, new sunscreen. 4. Apply a generous amount of sunscreen at least 30 minutes before going outdoors: you need a teaspoon on your face to achieve the SPF level on the label, and a shot glass worth for your body. Dont forget your ears, lips, hairline