14/10/2026
The image describes a comprehensive overview of Vitamin D deficiency, a condition where the body lacks sufficient levels of this fat-soluble vitamin produced by the skin through UVB sunlight exposure. Vitamin D is crucial for calcium absorption, promoting bone and teeth health, supporting muscle function, boosting the immune system, and regulating cell growth. The deficiency progresses across three stages, culminating in severe conditions like rickets in children, osteomalacia in adults, and increased osteoporosis risk. Common causes include inadequate sunlight, poor diet, darker skin, malabsorption, organ diseases, and exclusive breastfeeding. Key symptoms include fatigue, bone pain, muscle weakness, frequent infections, depression, and skeletal deformities.