The four influences on health status are:
medical care - 10% of health status - you don't have much control over medical care
lifestyle - 40% of health status - you have more control over your lifestyle
genetics - 30% of health status - you have no control over your genetics
environment - 20% of health status - you have some control over your environment
Examples of common indoor pollutants are: 1) mold and pollen, 2) asbestos, formaldehyde and lead. 3) tobacco smoke 4) household products and pesticides.
Examples of common outdoor pollutants are: 1) ozone - smog 2) diesel exhaust 3) nitrogen oxide 4) particulate matter
Sources of hazardous waste are: 1) Industrial hazardous waste 2) small quantity generators
The answer to your question would be B. 15-20%
When the skin is exposed to ultraviolet rays, the skin produces a molecule that is turned into Vitamin D.
Sun is the source of ultraviolet rays important for Vitamin D production. Due to this reason, in the case of Vitamin D deficiency, it is recommended by doctor's to absorb sunlight by skin. The Vitamin D production occurs specifically by UV B rays rays which lie in the range of 290-315 nanometer.
The chemical 7-dehydrocholesterol absorbs these rays and convert to previtamin D3. Further, previtamin D3 isomerizes to Vitamin D. Other than sunlight, Vitamin D can be taken through diet. The sources include seafood like fish, fish oil, dairy products, beef liver etc. Vitamin D is required for bone and teeth formation, muscle contraction, immune system etc.
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