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Parkinsons Disease
Research shows that men who exercise vigorously, strenuously (ex., strength training) have a 50-60% less likely chance of getting Parkinsons Disease. No such relationship has been shown for women. 
Source : CNN Sunday February 27, 2005

Folic Acid Study
Women who took 1000 mcg of folic acid daily were 46% less likely to develop high blood pressure per a study done by the American Journal of Medical Sciences. The study also found that vitamin supplements provided a better source of folic acid rather than food. Other benefits from taking folic acid: reduces the likelihood of birth defects and prevents heart disease and strokes. 
Source : CNN Monday, January 24, 2005

Worth noting is that there are many fruits and vegetables that contain folic acid as well as many foods that are now fortified with it. Also, all quality mult-vitamins contain folic acid.

Dietary Guidelines
Article on US report on nutrition and physical activity

Prostate Cancer
A study is currently underway to determine the effectiveness of the mineral Selenium and Vitamin E (alone or taken together) in preventing prostate cancer. All quality multi vitamins should contain both of these minerals and vitamins.

What we do know about prostate cancer is that by modifying your lifestyle and what you eat, you may lower the risk of prostate cancer. Here are some ways: 
- do not smoke
- moderate alcohol consumption
- eat a diet that is low in fat and high in grains, fruit and vegetables
- exercise regularly

Vitamin E
A recent study now finds that too much Vitamin E may contribute to heart disease. Dosages in excess of 200IU may turn vitamin E into a pro-oxidant rather than an anti-oxidant. It is recommended that your daily dose should not exceed 200IU. A healthy diet which includes fruits and vegetables provides 6-10 IU of vitamin E. Right now the safest dosage most likely would include what you consume daily from food plus what's contained in a multi-vitamin supplement.
 



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