Healthscience : 1 - UV sun is the main source of vitamin D our bodies. This vitamin is necessary for bones, muscles and our immune system. Vitamin D, can also combat the incidence and growth of tumor
2 - sunlight led to pineal gland activity in the brain. These glands produce chemicals called Tryptmyns that improves your mental state.
3 - exposure to sunlight and UV Artificial (synthetic). As an important factor receptor and before the skin cancer known.
4 - too much exposure to sunlight probably you catch four times more prone to cataract disease.
5 - sunburn can alter the distribution and function of white blood cells (immune cells). And also does harm to the body's DNA.