New research shows that older women with diabetes, if taking large doses of vitamin C, they may damage the heart.
Researchers with 2000 postmenopausal women with diabetes for as long as 15 years of follow-up study found that daily doses over 300 mg of vitamin C for women, died of a heart attack and stroke risk is that those who do not take vitamin C in women twice. The discovery was published in the latest issue of the United States, "Clinical Nutrition" magazine.
We know that diabetes blood contained vitamin C, often at a relatively low level. Many diabetic people taking vitamin C supplements to increase blood levels of vitamin C content. However, studies have shown that this is not a correct choice. Diabetic patients taking vitamin supplements should be more cautious than others.
The researchers pointed out that despite the diabetic patient's blood levels of vitamin C, often below the normal value, but the use of supplements to enhance the healthy level of vitamin C is still unknown.
In the study, researchers in the 2000 women with diabetes die of cardiovascular disease in the medical record to the record. From the beginning of the study, the women answered all the questions in the questionnaire, including: eating habits, exercise, high blood pressure and smoking habits. The results showed that in the next 15 years, those taking 300 mg per day of vitamin C more than the women, died of coronary heart disease or stroke risk is that those who do not take vitamin C twice as many women.
The researchers also pointed out the antioxidant defense system complexity. When antioxidants interact with free radicals, they must be turned into other antioxidant detoxification of pro-oxidants. This detoxification process occurs in diabetic patients who have very slow. In this case, the change in the molecule of vitamin C can damage human cells.
Researchers in favor of dietary intake of vitamin C and other nutrients, rather than intake from supplements. Although antioxidants in food can be biological and chemical balance, but a lack of vitamin pills could balance such a mechanism. The researchers speculate, therefore, taking a single high-dose antioxidants may interfere with the body and the former oxidant antioxidant balance.
Another study also shows that taking a daily high-dose antioxidants --- another vitamin E, not only can not prolong life, but may increase the risk of death.
