(1) Let's start with the obvious. Sunlight is the initiator of vitamin D3 creation in our bodies. Sunshine's UVB rays interact with the cholesterol in our skin that ignites a process to create vitamin D from our kidneys and liver. This doesn't happen without sunlight. Exposing more bare skin to sunlight is necessary for 20 to 30 minutes at least three or four times weekly. Glass windows and windshields block UVB rays while letting in UVA rays, which can be harmful. One irony is that most sunscreens block only UVB rays, thus inhibiting vitamin D3 production. As a pre-hormone, vitamin D3 has many internal health functions. Vitamin D3 production from sunlight has its own shut-down mechanism, safeguarding you from overdosing vitamin D. But if you wash the exposed skin with soap too soon, you may wash away the skin's oils that have just begun the vitamin D process. Tip: Use soap only where the sun didn't shine. Options for D3 without sunlight include supplements, of which too much is remotely possible, and UVB tanning beds. (2) Dr. Johanna Budwig promoted daily sunlight exposure in conjunction with her famous Budwig Diet for curing cancer. She had become aware of sunlight's electromagnetic contribution to the dietary elements of her successful cancer cures. (3) During long periods without sunshine, many get depressed. It's called seasonal affective disorder (SAD). Besides feeling gloomy, people experiences low energy. SAD results from an extended period of no sunshine. But it can be ameliorated during those periods with bright full spectrum lights or blue light to mimic the sun's rays. (4) A substance in our bodies called melatin may be able to convert sunlight into metabolic energy. There are studies looking into this. (5) Sunlight exposure was discovered to reduce the need for pain medication, stress, and anxiety among post operative patients in one hospital that conducted a study in 2005. (6) A 2012 neuroscience study determined that those who had six hours of sunlight exposure during the day were more alert in the evening. (7) A 2011 dermatological study observed the sunlight exposure helps burn subcutaneous fat, which is unattractive but doesn't necessarily affect cardiovascular health adversely. However, sunlight also helps reduce visceral fat indirectly. Vitamin D deficiencies have been associated to higher visceral fat production, which leads to obesity and subsequent health threatening diseases, including diabetes and cardiovascular issues. Caveat: So it's wise to avoid sunburn by developing a tan through gradual exposure times. A solid tan will protect your skin better than sunblocks. Source
