Fish fit the vitamin D bill; Sockeye salmon stand out
In addition to getting vitamin D from supplements, certain fish rank among the very few substantial food sources of vitamin D, far outranking milk and other D-fortified foods.
Among fish, wild sockeye Salmon rank as the richest source, with a single 3.5 ounce serving surpassing the US RDA of 600 IU by about 15 percent:
Vitamin D per 3.5 ounce serving*
Sockeye Salmon 687 IU
Albacore Tuna 544 IU
Silver Salmon 430 IU
King Salmon 236 IU
Sardines 222 IU
Sablefish 169 IU
Halibut 162 IU
*For our full test results, click here.
Nutrients and foods
We've reported on links between food factors and the risk for Alzheimer's several times:
Genetic factors in Alzheimer's
The APOE gene comes in several different forms, or alleles, three of which – APOE2, APOE3, and APOE4 – occur most often.
People who develop Alzheimer's are more likely to have an APOE4 allele than people who do not develop the disease.
APOE4 is present in about 25 to 30 percent of all people, and in about 40 percent of people with late-onset Alzheimer's.
People who inherit one or two APOE4 alleles also tend to develop the disease at an earlier age than those who do not have any APOE4 alleles.
Carriers of two E4 alleles have between 10 and 30 times the risk of developing AD by 75 years of age, compared to those not carrying any E4 alleles.
Why would the APOE variant matter?
Alzheimer's disease is characterized by – though not necessarily caused by – build-up of beta-amyloid protein plaque and tau protein tangles in the brain.
And some evidence suggests that people with APOE4 alleles are not as efficient at removing amyloid plaque.
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