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ASBMR: Vitamin D Content Varies in Farmed, Wild Fish

Levels fluctuate with type of fish and how it's prepared

FRIDAY, Sept. 22 (HealthDay News) -- Although fish are considered to be a good dietary source of vitamin D, the amount of vitamin D in fish ranges widely and depends on the type of fish and how it's prepared, according to research presented recently at the 28th annual meeting of the American Society for Bone and Mineral Research in Philadelphia. Overall, wild salmon contains more vitamin D than farmed salmon or other farmed fish.

Michael F. Holick, Ph.D., M.D., and colleagues at Boston University School of Medicine, used liquid chromatography-tandem mass spectroscopy to quantify the vitamin D content of one-gram samples of various types of seafood.

They found that farmed salmon contained about 10 percent to 25 percent of the vitamin D found in wild salmon (188 versus 1,091 IU/100 g) and farmed trout, bluefish and swordfish had about 50 percent of the vitamin D in wild salmon. Cod, grey sole, haddock, squid and clams contained less than 10 percent of wild salmon's vitamin D.

"Thus, epidemiology studies that have evaluated dietary intake of vitamin D, if they have depended on the dietary tables and if the subjects were eating farmed rather than wild-caught salmon, the vitamin D ingested may be only 10 to 25 percent of what was reported," the authors conclude. "The vitamin D content in foods need to be re-evaluated and the food charts need to be updated."

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