Group 1 - The core viewpoint of the articles emphasizes a shift in beauty standards among young people in China, advocating for "natural beauty" over the traditional "white, young, and thin" aesthetic [2][3] - A survey conducted by China Youth Daily and Wenjuan.com revealed that 72.4% of young respondents believe "natural beauty" should replace the "white, young, and thin" standard [3][4] - Key characteristics of "healthy beauty" identified by respondents include rosy complexion (63.5%), strong and proportionate body (62.2%), and natural, glowing skin (55.5%) [3][4] Group 2 - The articles highlight the importance of bone health, with experts suggesting that young people should focus on maintaining a healthy lifestyle to prevent conditions like osteoporosis [4][5] - Recommendations from respondents include incorporating bone density, body fat percentage, and muscle mass into health check-ups, with 57.0% supporting this initiative [4][6] - The articles also discuss common misconceptions among young people regarding health and beauty, such as the belief that complete sun protection is necessary and that frequent face masking equates to deep hydration [4][5] Group 3 - Suggestions for promoting a "healthy beauty" lifestyle include organizing outdoor team-building activities by companies, promoting scientific fitness and balanced nutrition in schools and communities, and advocating for diverse beauty standards [6] - The demographic breakdown of the survey respondents shows that 63.7% are female and 36.3% are male, with the majority being born in the 1990s [6]

Core Viewpoint - Effective sun protection is essential during summer, balancing the need to prevent skin damage from UV rays while ensuring adequate sunlight exposure for health benefits [1][2][4] Group 1: Importance of Sun Protection - Ignoring sun protection can lead to skin damage, including sunburn, which is a common issue during summer activities [1][2] - UV radiation from sunlight can cause various skin issues, with UVB primarily causing sunburn and UVA penetrating deeper, leading to collagen damage and skin aging [1][2] - Prolonged exposure to UV radiation is classified as a Group 2B carcinogen, increasing the risk of skin cancer due to DNA damage and immune suppression [2] Group 2: Risks of Over-Protection - Over-protection from the sun, such as excessive use of protective clothing and high-SPF sunscreens, can also pose health risks [3][4] - Insufficient sunlight exposure can lead to vitamin D deficiency, affecting bone health and increasing the risk of chronic diseases [4] - Lack of sunlight can suppress serotonin production, leading to negative emotional states such as anxiety and depression [4] Group 3: Guidelines for Scientific Sun Protection - A balanced approach to sun protection involves using sunscreen while ensuring some sun exposure, avoiding peak UV radiation times [6] - Recommended sunscreen includes SPF 30+ for daily use and SPF 50+ for outdoor activities, with reapplication every two hours [6] - Special considerations for vulnerable groups, such as infants and children, include avoiding direct sunlight and using gentle, non-irritating sunscreen [7] Group 4: Dietary Considerations and Eye Protection - Certain foods can exacerbate sun sensitivity, and individuals with sun-related skin conditions should avoid specific fruits and vegetables [7] - Sunglasses with 100% UV or UV400 protection are recommended to shield the eyes from harmful UV rays [8] - Lens color can affect light filtration, with gray and brown lenses being optimal for daily use [8]

Core Viewpoint - Overexposure to sun protection measures can lead to vitamin D deficiency, which is linked to osteoporosis, as demonstrated by a case of a 26-year-old girl diagnosed with the condition due to excessive sun protection [1][3]. Group 1: Impact of Sun Protection on Vitamin D - Sun protection methods, while preventing skin damage, significantly reduce the body's ability to synthesize vitamin D, which is crucial for calcium absorption and bone health [3][5]. - Approximately 80% to 90% of vitamin D is synthesized through skin exposure to UVB rays, and just 10 to 30 minutes of daily sun exposure is sufficient for adequate vitamin D levels [5][7]. Group 2: Vitamin D Deficiency Statistics - In China, there is a notable prevalence of vitamin D deficiency among children aged 0-18, with a severe deficiency rate of 2.46%, a deficiency rate of 21.57%, and an insufficiency rate of 28.71% [7]. Group 3: Recommended Vitamin D Intake - The recommended daily intake of vitamin D is 400 IU (10 micrograms) for individuals aged 0-65, and 600 IU (15 micrograms) for those over 65 [7][11]. Group 4: Risks of Excessive Vitamin D - While vitamin D toxicity is rare, it can occur, leading to symptoms such as hypercalcemia, which may result in kidney stones and other health issues [8][10]. Group 5: Safe Supplementation Practices - The safe upper limit for daily vitamin D intake is 2000 IU (50 micrograms), and individuals should be cautious not to exceed this amount when taking supplements [10][11]. - Outdoor activities and sun exposure are the most effective ways to obtain vitamin D, with dietary sources such as fatty fish and fortified milk also contributing to intake [11][13].