While sunlight is the primary source of vitamin D, food plays a crucial role, especially for those with limited sun exposure. It is essential to know the food sources of vitamin D because this vitamin is essential for bone health, immune function, and overall well-being. It helps the body absorb calcium, ensuring strong bones and reducing the risk of osteoporosis. While sunlight is the primary source of vitamin D, food plays a crucial role, especially for those with limited sun exposure. It is essential to know the food sources of vitamin D because this vitamin is essential for bone health, immune function, and overall well-being. It helps the body absorb calcium, ensuring strong bones and reducing the risk of osteoporosis.