Peter P. Zandi, Ph.D., of The Johns Hopkins University Bloomberg School of Public Health, Baltimore, and colleagues examined the relationship between antioxidant supplement use and risk of AD.
The researchers assessed the prevalence of dementia and AD in 4,740 elderly (65 years or older) residents of Cache County, Utah in 1995 to 1997 and collected information about supplement use. These residents were followed-up in 1998 to 2000 for new cases of dementia or AD. The researchers identified 200 cases of AD (prevalent cases) between 1995 and 1997, and 104 new cases (incident cases) of AD during follow-up.
The researchers categorized participants as vitamin E users if they reported taking an individual supplement of vitamin E or a multivitamin containing more than 400 IU (international units) of vitamin E. Vitamin C users reported taking vitamin C supplements or multivitamins containing at least 500 micrograms of ascorbic acid. Individuals were classified as multivitamin users if they reported taking multivitamins containing lower doses of vitamin E or C.
The researchers found the greatest reduction in both prevalence and incidence of AD in participants who used individual vitamin E and C supplements in combination, with or without an additional multivitamin. "Use of vitamin E and C (ascorbic acid) supplements in combination reduced AD prevalence [by about 78 percent] and incidence [by about 64 percent]," the authors write.
The researchers also found "no appreciable association with the use of vitamin C alone, vitamin E alone, or vitamin C and multivitamins in combination," and prevalence of AD.
"The current… recommended daily allowance for vitamin E is 22 IU (15 micrograms), and for vitamin C (ascorbic acid), 75 to 90 micrograms," the researchers write. "Multivitamin preparations typically contain these approximate quantities of both vitamins E and C (more vitamin C in some instances), while individual supplements typically contain doses up to 1,000 IU of vitamin E and 500 to 1,000 micrograms or more of vitamin C (ascorbic acid). Our findings suggest that vitamins E and C may offer protection against AD when taken together in the higher doses available from individual supplements."
Antioxidant vitamin supplements, particularly vitamins E and C, may protect the aging brain against damage associated with the pathological changes of Alzheimer's disease, according to a study conducted by the Johns Hopkins Bloomberg School of Public Health and other institutions. The researchers believe antioxidant vitamin supplements may be an ideal prevention strategy for our aging population as they are relatively nontoxic and are thought to have wide-ranging health benefits. The study, "Reduced Risk of Alzheimer's Disease in Users of Antioxidant Vitamin Supplements" is published in the January 2004, issue of the journal Archives of Neurology.
Peter P. Zandi, PhD, lead author of the study and an assistant professor in the School's Department of Mental Health, said, "These results are extremely exciting. Our study suggests that the regular use of vitamin E in nutritional supplement doses, especially in combination with vitamin C, may reduce the risk of developing Alzheimer's disease."
The researchers examined data from the Cache County Study, which is a large, population-based investigation of the prevalence and incidence of Alzheimer's disease and other dementias. Residents who were 65 or older were assessed from 1996-1997 and again from 1998-2000. Study participants were asked at their first contact about vitamin usage. The researchers then compared the subsequent risk of developing Alzheimer's disease over the study interval among supplement users versus nonusers to come to their conclusions.
Researchers believe the most effective doses were vitamin E in liquid capsules of 400 to 1,000 International Units and vitamin C in pill form of 500 to 1,500 milligrams.
If you want to take Vitamin E to reduce your risk of Alzheimer's Disease then be aware that it is best to take E with oil and perhaps a food grain for maximum absorption. (same article here)
The pill of 400 I.U. vitamin E taken with just a glass of milk, in theory should have provided more than 13 times the RDA of this nutrient. But, in fact, it raised the level of new vitamin E in the blood by only 3 percent. By comparison, the cereal fortified with 30 I.U. vitamin E raised the blood plasma level of new vitamin E five times higher than that, and the cereal fortified with 400 I.U. raised the new blood plasma level 30 times higher.
The effect of a pill of 400 I.U. taken with a serving of plain wheat cereal was inconsistent; some participants had a significant increase in blood plasma levels of vitamin E, others almost none. "This study clearly showed that applying vitamin E onto a grain cereal provided a huge and consistent increase in its bioavailability," said Scott Leonard, an LPI research assistant who conducted the study. "Even 30 I.U., the RDA for this vitamin, produced a large increase in new blood plasma levels."
Vitamin E with pasta and a pasta sauce with oil would probably be a great way to maximize absorption.
|Share |||Randall Parker, 2004 January 20 02:18 AM Brain Alzheimers Disease|