Receiving the best form of vitamin E is critical in obtaining
the health benefits of this essential vitamin. One recent study
showed that gamma-tocopherol, (which is the form that is highest
in food) may actually be superior to alpha-tocopherol (the type
that is found in most supplements) in the prevention of Alzheimer’s
disease.
Researchers speculate this may explain the absence of vitamin E
protection against Alzheimer's reported in some previous studies
with the use of vitamin E supplements. Most of the previous studies
have used vitamin E supplements that only contained alpha-tocopherol.
To reach this conclusion, researchers examined whether gamma-tocopherol,
alpha-tocopherol equivalents (measure of the relative biologic activity
of tocopherols and tocotrienols) or individual tocopherols would
protect against Alzheimer’s and cognitive decline over a period
of six years.
The study included:
- The administration of four cognitive tests
- Clinical evaluations for Alzheimer’s
- Food-frequency questionnaire for dietary assessment
Results indicated various tocopherol forms, rather than solely
alpha-tocopherol, may be important in the vitamin E protective association
with Alzheimer’s.
American
Journal of Clinical Nutrition February 2005 Vol. 81(2) 508-514
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