Human health is connected to nature in many ways. Two of these ways involve the sun and the healthy foods that we eat. Nature, particularly the sun, helps our bodies to make one of the vital nutrients, vitamin D, which keeps our bodies healthy. In this article, we explain how our bodies make vitamin D, which is also called the “sunshine vitamin.” We will also explain the important roles vitamin D plays in humans, such as helping the immune system, regulating our hormones, and keeping the bones, heart, and brain healthy.