why does the body need sun?

Question

give your sources

Answer 1

The D3 form of vitamin D is produced almost exclusively by a photochemical process in the skin. No natural dietary source has been found, and apparently no effective synthetic source.

Sunlight is the best natural antidote to Seasonal Affective Disorder, though full-spectrum artificial light works fairly well as a substitute.

Those are the direct benefits that we know about. Sunlight is part of the natural environment for which the bodies of nearly all plants and animals were designed or evolved. It wouldn't be surprising to discover additional requirements. It's probably not accidental that skin tones associated with modest, regular exposure to sunlight are generally described as 'healthy' as opposed to pale, deathly.

Answer 2

Sun act as a source of light ,energy & vitamin D 4 our body.

Answer 3

The sun is the energy in the photosynthesis reaction that produces food for us to eat.
We feel warm in the sun. There is a psychosis where people become depressed with too little sun in the winter.
The skin contains a chemical called egosterol that changes to vitamin D in sunlight. Our milk is fortified with vitamin D, because vitamin D is needed for the absorption and placement of calcium to build bones.
Solar heating to keep our shelters warm and produce warm water.

Answer 4

Directly,
1) Vitamin D,
2) psychological benefit to daylight(not sure of the scientific info on this)
3) light to see(probably wouldn't have discovered fire or anything if we couldn't even see everything around us),
4) For rain, wouldn't have rain without precipitation caused by the sun, which means no re-distribution of water, to water plants and for human consumption...
5) provides correct temperature for us to survive

Everything has purpose in life, and so many variables are 'just right' to breed life.

Answer 5

Because the Sun gives out vitamin, I think it's vitamin D

Answer 6

melanin present in under the skin icreases in the presence of sunlight.this increases the production of vitamin D.

the only source of vitamin D other than pills is the sun.

Answer 7

Vitamin D is a group of fat-soluble prohormones, the two major forms of which are vitamin D2 (or ergocalciferol) and vitamin D3 (or cholecalciferol).[1] The term vitamin D also refers to metabolites and other analogues of these substances. Vitamin D3 is produced in skin exposed to sunlight, specifically ultraviolet B radiation.

Vitamin D plays an important role in the maintenance of organ systems.[2]

Vitamin D regulates the calcium and phosphorus levels in the blood by promoting their absorption from food in the intestines, and by promoting re-absorption of calcium in the kidneys.
It promotes bone formation and mineralization and is essential in the development of an intact and strong skeleton.
It inhibits parathyroid hormone secretion from the parathyroid gland.
Vitamin D affects the immune system by promoting immunosuppression, phagocytosis, and anti-tumor activity.
Vitamin D deficiency can result from inadequate intake coupled with inadequate sunlight exposure, disorders that limit its absorption, conditions that impair conversion of vitamin D into active metabolites, such as liver or kidney disorders, or, rarely, by a number of hereditary disorders.[2] Deficiency results in impaired bone mineralization, and leads to bone softening diseases, rickets in children and osteomalacia in adults, and possibly contributes to osteoporosis. Vitamin D deficiency may also be linked to many forms of cancer.

Wikepedia

Answer 8

because the vitamin D inside our body need the sun light to transfer them into calcium.

Answer 9

1. Heat (without it we would freeze).
2. To make vitamin D (vitamin D can be found in foods such as fish as well).

Answer 10

Because you get Vitamin D from it