Core Viewpoint - Excessive sun protection measures can lead to vitamin D deficiency, resulting in osteoporosis due to insufficient calcium absorption [3][6]. Group 1: Understanding Osteoporosis - Osteoporosis is a metabolic bone disease characterized by decreased bone formation and increased bone resorption, leading to fragile and porous bones [1]. - Insufficient vitamin D absorption due to excessive sun protection can cause calcium deficiency, which is a key factor in the development of osteoporosis [3]. Group 2: Importance of Sun Exposure - While sun protection is necessary, some exposure to ultraviolet (UV) rays is essential for vitamin D synthesis [3][16]. - It is recommended to have 10-15 minutes of sun exposure without protection during non-peak hours to aid in vitamin D production [16]. Group 3: Effective Sun Protection Strategies - Proper sun protection should balance UV exposure and vitamin D synthesis; full coverage can hinder vitamin D absorption [3][10]. - Recommended sun protection measures include using products from reputable manufacturers and applying sunscreen 20-30 minutes before sun exposure [10][12]. - Different SPF levels are suggested based on activity: SPF 15 for daily use, SPF 25-35 for outdoor activities, and SPF 35-50 for beach outings [14].