Assertion: melanin's region | /r/Synonym | cool temperate zones
Facets:
Source sentences:
text: Article says "With humans, exposure to sunlight stimulates the skin to produce vitamin D. Because high levels of cutaneous melanin act as a natural sun screen, dark skin can be a risk factor for vitamin D deficiency in regions of the Earth known as cool temperate zones; i.e. above 36 degrees latitude in the Northern hemisphere and below 36 degrees in the Southern hemisphere" However Pro vitamin d is produced by UVB (280- 315nm) according toSunlight, vitamin D and skin cancer
text: Now the Wikpedia article says "Because high levels of cutaneous melanin act as a natural sun screen, dark skin can be a risk factor for vitamin D deficiency in regions of the Earth known as cool temperate zones" That should be "dark skin may be a risk factor " because the Institute of Medicine of the National Academies' recent report says "some subgroups—particularly those who are older and living in institutions or who have dark skin pigmentation—may be at increased risk for getting too little vitamin D".
text: With humans, exposure to sunlight stimulates the skin to produce vitamin D. Because high levels of cutaneous melanin act as a natural sun screen, dark skin can be a risk factor for vitamin D deficiency in regions of the Earth known as cool temperate zones, i.e., above 36 degrees latitude in the Northern hemisphere and below 36 degrees in the Southern hemisphere.