Why does sunlight help your body in surprising ways?
Sunlight's Secret Jobs
Why does sunlight help your body in surprising ways?
You probably know sunlight helps you see where you're going and makes plants grow. But inside your body, sunlight is doing something much stranger — it's flipping switches, winding clocks, and building tiny construction materials you can't get any other way.
Start with your skin. When ultraviolet light from the sun hits a waxy molecule called 7-dehydrocholesterol living in your skin cells, it rearranges that molecule's shape — like folding an origami crane from a flat paper square. That new shape? Vitamin D. Your body can't make it without sunlight's energy to do the folding.
