Sunlight triggers the release of serotonin and endorphins. It reduces the risk of prostate, breast, colorectal, and pancreatic cancers. It reduces inflammation and decreases autoimmune responses.

Sun rays do increase the rate of skin cancer, but for every one person that dies of skin cancer, over 100 die from cardiovascular disease.

• People who get carcinomas tend to be healthy people that get plenty of sunlight. Carcinomas are seldom fatal.
• Melanoma, the deadly type of skin cancer, accounts for 1 - 3 % of new skin cancers. The most significant cause of melanomas is sporadic sunburn.

A dermatologist discovered our skin uses sunlight to make nitric oxide, a molecule in the body that dilates blood vessels and lowers blood pressure.

He exposed volunteers to the equivalent of 30 minutes of summer sunlight without sunscreen. The result? The nitric oxide levels in the volunteers went up, and their blood pressure lowered. Because of the connection of high blood pressure to heart disease and strokes, this discovery can prevent millions of deaths globally.

Vitamin D is essential for calcium absorption and many other biological processes. Lower levels of Vitamin D increase the rates of almost every disease like cancer, diabetes, osteoporosis, cognitive impairment, autoimmune conditions and more.

Vitamin D is a hormone manufactured by the skin when you are in the sun. It is difficult to obtain enough through diet. 

Getting vitamin D through supplementation shows zero benefits. A study over a period of 5 years found supplementing with Vitamin D had no impact on cancer, heart disease, or stroke.

A number of researchers now argue that people with high vitamin D levels are healthy not because of the vitamin, but because they get plenty of exposure to the sun. Vitamin D is just a marker of that fact.