“全副武装”反致骨质疏松 科学防晒拿捏“分寸”很重要

Core Viewpoint - Excessive sun protection measures can lead to vitamin D deficiency, increasing the risk of osteoporosis, particularly among young people and adults [1][2][5][6]. Group 1: Osteoporosis and Vitamin D - Osteoporosis is a metabolic bone disease characterized by decreased bone formation and increased bone resorption, leading to fragile and porous bones [1]. - Vitamin D is crucial for calcium absorption; insufficient vitamin D results in poor calcium absorption, which can lead to osteoporosis [4]. - The trend of osteoporosis is becoming more prevalent among younger populations, raising concerns about the long-term health implications [5]. Group 2: Sun Protection Measures - Full sun protection, including hats, sunglasses, and sunscreen, while effective against UV rays, can hinder vitamin D synthesis [2][4]. - Medical professionals emphasize the importance of balanced sun exposure to maintain adequate vitamin D levels, especially during summer [6][15]. Group 3: Recommendations for Sun Protection - Effective sun protection should focus on blocking UVA and UVB rays, which can penetrate the atmosphere and affect the skin [10][12]. - Recommendations include using sunscreen with appropriate SPF and PA ratings based on the activity level and duration of sun exposure [13]. - It is advised to allow for short periods of sun exposure (10-30 minutes) without protection to facilitate vitamin D synthesis [15].