Here are some friends with simlar question as we.And I have this question for many days,anyone help us?
Kitty said: Yes.What about vitamin D?-I try seach this on internet but no results found.Maybe this is a stupid question.
Mike said: oh,no,you are wrong.I have found as below for this question(What about vitamin D?),it will help you,my kids.
Answer:
Preformed vitamin D is not needed by the body, it can be synthesized by exposure to sunshine of dehydrocholesterol present in the skin. Vitamin D created this way lasts in the body for many months such that it is possible to "top-up" one's vitamin D levels over the summer for the coming winter. Excess consumption of pre-formed Vitamin D can be dangerous. The Vitamin D in cow's milk is artificially added. In the UK margarine is fortified with vitamin D by law and some soya milks are also fortified.
30 Minutes of Sun A day is 100% DV of vitamin D.
The best way to get vitamin D is from the sun. Another good way is OJ with calcium and vitamin D and fortified cereals.
Vitamin D refers to 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 several 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 and anti-tumor activity.
Several forms of vitamin D have been described. The two major forms are vitamin D2 or ergocalciferol, and vitamin D3 or cholecalciferol.
Vitamin D1: molecular compound of ergocalciferol with lumisterol, 1:1
Vitamin D2: ergocalciferol or calciferol (made from ergosterol)
Vitamin D3: cholecalciferol (made from 7-dehydrocholesterol in the skin).
Vitamin D4: dihydrotachysterol
Vitamin D5: sitocalciferol (made from 7-dehydrositosterol)
Chemically, the various forms of vitamin D are secosteroids; i.e. broken-open steroids.[3] The structural difference between vitamin D2 and vitamin D3 is in their side chains. The side chain of D2 contains a double bond between carbons 22 and 23, and a methyl group on carbon 24.
Vitamin D2 is derived from fungal and plant sources, and is not produced by the human body. Vitamin D3 is derived from animal sources and is made in the skin when 7-dehydrocholesterol reacts with UVB ultraviolet light at wavelengths between 270–290 nm.[4] These wavelengths are present in sunlight at sea level when the sun is more than 45° above the horizon, or when the UV index is greater than 3.[5] Adequate amounts of vitamin D3 can be made in the skin only after ten to fifteen minutes of sun exposure at least two times per week to the face, arms, hands, or back without sunscreen. With longer exposure to UVB rays, an equilibrium is achieved in the skin, and the vitamin simply degrades as fast as it is generated.[1]
In most mammals, including humans, D3 is more effective than D2 at increasing the levels of vitamin D hormone in circulation.[6] However, in some species, such as rats, vitamin D2 is more effective than D3.[7] Both vitamin D2 and D3 are used for human nutritional supplementation, and pharmaceutical forms include calcitriol (1alpha, 25-dihydroxycholecalciferol), doxercalciferol and calcipotriene.[8]
http://en.wikipedia.org/wiki/vitamin_d...
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correctness,It's Non-profit and only for informational purposes.
PRE: What advice do you have for a new vegetarian? NEXT: NONE
Kitty said: Yes.What about vitamin D?-I try seach this on internet but no results found.Maybe this is a stupid question.
Mike said: oh,no,you are wrong.I have found as below for this question(What about vitamin D?),it will help you,my kids.
Answer:
Preformed vitamin D is not needed by the body, it can be synthesized by exposure to sunshine of dehydrocholesterol present in the skin. Vitamin D created this way lasts in the body for many months such that it is possible to "top-up" one's vitamin D levels over the summer for the coming winter. Excess consumption of pre-formed Vitamin D can be dangerous. The Vitamin D in cow's milk is artificially added. In the UK margarine is fortified with vitamin D by law and some soya milks are also fortified.
30 Minutes of Sun A day is 100% DV of vitamin D.
The best way to get vitamin D is from the sun. Another good way is OJ with calcium and vitamin D and fortified cereals.
Vitamin D refers to 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 several 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 and anti-tumor activity.
Several forms of vitamin D have been described. The two major forms are vitamin D2 or ergocalciferol, and vitamin D3 or cholecalciferol.
Vitamin D1: molecular compound of ergocalciferol with lumisterol, 1:1
Vitamin D2: ergocalciferol or calciferol (made from ergosterol)
Vitamin D3: cholecalciferol (made from 7-dehydrocholesterol in the skin).
Vitamin D4: dihydrotachysterol
Vitamin D5: sitocalciferol (made from 7-dehydrositosterol)
Chemically, the various forms of vitamin D are secosteroids; i.e. broken-open steroids.[3] The structural difference between vitamin D2 and vitamin D3 is in their side chains. The side chain of D2 contains a double bond between carbons 22 and 23, and a methyl group on carbon 24.
Vitamin D2 is derived from fungal and plant sources, and is not produced by the human body. Vitamin D3 is derived from animal sources and is made in the skin when 7-dehydrocholesterol reacts with UVB ultraviolet light at wavelengths between 270–290 nm.[4] These wavelengths are present in sunlight at sea level when the sun is more than 45° above the horizon, or when the UV index is greater than 3.[5] Adequate amounts of vitamin D3 can be made in the skin only after ten to fifteen minutes of sun exposure at least two times per week to the face, arms, hands, or back without sunscreen. With longer exposure to UVB rays, an equilibrium is achieved in the skin, and the vitamin simply degrades as fast as it is generated.[1]
In most mammals, including humans, D3 is more effective than D2 at increasing the levels of vitamin D hormone in circulation.[6] However, in some species, such as rats, vitamin D2 is more effective than D3.[7] Both vitamin D2 and D3 are used for human nutritional supplementation, and pharmaceutical forms include calcitriol (1alpha, 25-dihydroxycholecalciferol), doxercalciferol and calcipotriene.[8]
http://en.wikipedia.org/wiki/vitamin_d...
correctness,It's Non-profit and only for informational purposes.
PRE: What advice do you have for a new vegetarian? NEXT: NONE
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