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Adults with type 2 diabetes may experience memory declines immediately after eating unhealthy meal

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By Baycrest Centre for Geriatric Care • www.ProHealth.com • June 29, 2008


Can be offset by taking antioxidant vitamins with meal, but a healthy diet rich in fruits and vegetables is best defense.

Adults with type 2 diabetes who eat unhealthy, high-fat meals may experience memory declines immediately afterward, but this can be offset by taking antioxidant vitamins with the meal, according to new research from Baycrest [a Toronto-based Research Center for Aging and the Brain.]

There is already growing evidence linking diabetes to cognitive complications in humans. Adults with type 2 diabetes are especially vulnerable to acute meal-induced memory deficits after eating unhealthy foods.

This latest study, led by Baycrest and published in the July issue of Nutrition Research,* suggests that taking high doses of antioxidant vitamins C and E with the meal may help minimize those memory slumps.

"Our bottom line is that consuming unhealthy meals for those with diabetes can temporarily further worsen already underlying memory problems associated with the disease,"said lead author Michael Herman Chui, who conducted the research as a University of Toronto pathobiology undergraduate in the Kunin-Lunenfeld Applied Research Unit (KLARU) at Baycrest. "We've shown that antioxidant vitamins can minimize oxidative stress from the meal and reduce those immediate memory deficits."

Type 2 diabetes is associated with chronic oxidative stress, a major contributor to cognitive decline and Alzheimer disease.

Consuming unhealthy foods can induce this type of stress which is triggered by acute elevations of free radicals – unstable molecules that can damage tissue, including brain tissue. These destructive molecule reactions typically occur over a one-to-three hour period after food ingestion.

Dr. Carol Greenwood, senior author of the study and a nationally recognized expert in how diet impacts brain function, cautioned that relying on antioxidant vitamins at meal time is not a quick fix. "While our study looked at the pill form of antioxidants, we would ultimately want individuals to consume healthier foods high in antioxidants, like fruits and vegetables," said Dr. Greenwood, a KLARU senior scientist at Baycrest.

Maintaining a healthy lifestyle that includes regular exercise, a low fat diet rich in antioxidants, and staying mentally active and socially engaged in a variety of activities, is the best medicine for optimizing cognitive health during the lifespan, she said.

The Study

In the study, 16 adults (aged 50 years and older) with type 2 diabetes participated in an unblinded trial where they attended three weekly sessions that involved consuming a different test meal.

  • One meal consisted of high fat products – a danish pastry, cheddar cheese and yogurt with added whipped cream;
  • The second meal consisted of only water consumption;
  • And the third test meal was the high-fat meal plus high doses of vitamins C (1000 mg) and E (800 IU) tablets.
  • Fifteen minutes after starting meal ingestion, participants completed a series of neuropsychological tests lasting 90 minutes that measured their recall abilities for words they had heard and paragraph information they had read. These cognitive skills are associated with the brain's memory centre – the hippocampus.

    Researchers found that vitamin supplementation consistently improved recall scores relative to the meal alone.

  • Participants who ate the high fat meal without vitamin supplements showed significantly more forgetfulness of words and paragraph information in immediate and time delay recall tests, relative to those who had the water meal or the meal with antioxidant vitamins.
  • Those on water meal and meal with vitamins showed similar levels in cognitive performance.
  • Dr. Greenwood and medical student M.H. Chui emphasize that their findings require further replication in larger studies with more participants. Future studies will need to look at whether antioxidant vitamins are:

  • Directly targeting oxidative stress reactions,
  • Or triggering an independent memory-enhancing ability which is simply masking the detrimental effects.
  • * * * *

    * Reference: Nutrition Research “Antioxidant vitamins reduce acute meal-induced memory deficits in adults with type 2 diabetes,” July 2008. 28(7), pp 423-429. doi:10.1016/j.nutres.2008.03.016, by Chui MH and Greenwood CE. Kunin-Lenenfeld Applied Research Unit and Department of Food and Nutrition Services, Baycrest, Toronto, Ontario, Canada.

    The study was funded by a grant from the Natural Sciences and Engineering Research Council of Canada. BaycrestBaycrest Centre for Geriatric Care is an academic health sciences centre, internationally-renowned for its care of aging adults and its excellence in aging brain research, clinical treatments and promising cognitive rehabilitation strategies. Baycrest is fully affiliated with the University of Toronto.

    ____
    Note: This information has not been evaluated by the FDA. It is generic and is not meant to prevent, diagnose, treat or cure any condition, illness, or disease. It is very important that you make no change in your healthcare plan or health support regimen without researching and discussing it with your professional healthcare team.




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