Crystal,
Where did you find your information on the 1,000 IU a day as a recommended requirement for Vitamin D?
Here's what the Mayo Clinic says:
"The National Academy of Sciences currently recommends 200 international units (IU) of vitamin D a day for children and adults up to age 50. This is about the amount of vitamin D in 3 ounces of tuna or 16 ounces of fortified milk. For adults older than age 50, the recommendation increases to 400 to 600 IU a day. If you're not getting enough vitamin D, your doctor may recommend vitamin D supplements. Still, moderation is important."
The clinic notes that we're unlikely to ever get too much Vitamin D from the FOODS we eat. But in regards to supplements: "Over time, however, megadoses of vitamin D supplements can cause nausea, vomiting, poor appetite, constipation, weakness and weight loss. More seriously, excessive doses of vitamin D can raise the level of calcium in your blood — which can cause confusion and changes in heart rhythm. Generally, the upper limit for vitamin D is 2,000 IU a day."
Here's the Mayo Clinic source:
http://www.mayoclinic.com/health/vitamin-d/AN01864
And here's the National Institutes of Health Dietary Supplement Fact Sheet, which recommends 200 IU from birth to age 50, 400 IU from ages 51 to 70, and 600 IU from ages 70 up:
http://ods.od.nih.gov/factsheets/vitamind.asp#h2
That page also lists a lot of foods and the IU equivalent of how much Vitamin D they contain.
Can you reconcile these recommended IUs with the sources for the 1,000 a day number you have? I'd appreciate it, as I'm very interested in this topic.
Comment Reply
Crystal,
Where did you find your information on the 1,000 IU a day as a recommended requirement for Vitamin D?
Here's what the Mayo Clinic says:
"The National Academy of Sciences currently recommends 200 international units (IU) of vitamin D a day for children and adults up to age 50. This is about the amount of vitamin D in 3 ounces of tuna or 16 ounces of fortified milk. For adults older than age 50, the recommendation increases to 400 to 600 IU a day. If you're not getting enough vitamin D, your doctor may recommend vitamin D supplements. Still, moderation is important."
The clinic notes that we're unlikely to ever get too much Vitamin D from the FOODS we eat. But in regards to supplements: "Over time, however, megadoses of vitamin D supplements can cause nausea, vomiting, poor appetite, constipation, weakness and weight loss. More seriously, excessive doses of vitamin D can raise the level of calcium in your blood — which can cause confusion and changes in heart rhythm. Generally, the upper limit for vitamin D is 2,000 IU a day."
Here's the Mayo Clinic source:
http://www.mayoclinic.com/health/vitamin-d/AN01864
And here's the National Institutes of Health Dietary Supplement Fact Sheet, which recommends 200 IU from birth to age 50, 400 IU from ages 51 to 70, and 600 IU from ages 70 up:
http://ods.od.nih.gov/factsheets/vitamind.asp#h2
That page also lists a lot of foods and the IU equivalent of how much Vitamin D they contain.
Can you reconcile these recommended IUs with the sources for the 1,000 a day number you have? I'd appreciate it, as I'm very interested in this topic.
June 22, 2009 - 9:50amThis Comment
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