To Little Sunlight: Sun is the primary source of human

To Little Sunlight: Sun is the primary source of human assimilable (usable) Vitamin-D, which is required for correct digestion and nutrient uptake. When Vitamin-D is reduced or absent, nutrient uptake is reduced or interrupted. This leads to malnourishment and resulting challenges.

Solution: Get some Sun every day. Preferably full body Sun. Live somewhere cold and dark in the winter? Move! This may seem harsh and if you seem to have health challenges, move to a sunny location for a few years and see how you improve. Sun, and lots of it, is essential for health.

If you live where the sun seems brutal, then take direction from tropical peoples. They all have "Island Glow" and rarely have skin cancer or aged skin. Why? Coconuts. If you live in a location like this, make sure you have access to lots of fresh coconuts and you'll be amazed how the sun revitalizes your skin.