Thursday, October 29, 2009 2:27:03 AM GMT
Wednesday, October 28, 2009 9:35:07 PM GMT
Q. I recently read that Vitamins A, D, E, and K are fat soluble, meaning that they dissolve in fat instead of water. Does this mean that these vitamins need to be eaten with some type of fat source for the body to absorb them? For instance, if somebody ingested just a cup of skim milk would any of the Vitamin D not be absorbed because of the lack of fat?
A. It's not so much that fat-soluble vitamins dissolve in fat, but that they are carried across the intestinal cell barrier by lipid (fat) molecules. So, while it is true that fats are necessary for transport and absorption of fat-soluble vitamins, it doesn't take much! You generally have enough lipids on hand in the gut to handle any fat-soluble vitamins that come along, even if they are eaten with a low-fat or fat-free meal.
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