The best known benefit of moderate sun exposure is vitamin D synthesis, which occurs in the skin in response to the sun’s UVB rays. Vitamin D is a critical nutrient. It’s essential to promote absorption of calcium, the mineral that helps keep bones strong. Moderate sun exposure benefits your health, including stronger bones, better sleep, improved mood, boosted immune system, and overall longevity.
The research is ongoing, but so far studies suggest that UV exposure might lower blood pressure (which helps to protect against heart attack and stroke), curb appetite, and reduce the risk of obesity, type 2 diabetes, and possibly certain autoimmune diseases.