google7fe7e6420122196f.html Preventive Medicine: The Magic of Vitamin C on Diabetes

Tuesday, December 2, 2008

The Magic of Vitamin C on Diabetes

When i browse the internet, i find so many sites that explain about the magic of Vitamin C. Even i found a blog about Vitamin C freak club.. Well, i believe that in years later, the vitamin c will become one of main therapy for some disease, not just for the adjuvant therapy. So now, i try to consume vitamin C in my daily diets. Now, i found an interesting article about diabetes prevention and therapy by the use of Vitamin C.

Higher plasma vitamin C levels linked with lower diabetes risk

In the July 28, 2008 issue of the American Medical Association journal Archives
of Internal Medicine,researchers at Addenbrooke’s Hospital and the University of
Cambridge in England report an association between higher plasma vitamin C
levels in middle-aged adults and a lower risk of developing type 2 diabetes.
The study included 21,831 healthy, nondiabetic participants in the European
Prospective Investigation of Cancer-Norfolk study, which was created to examine
the association between diet and cancer. Vitamin C levels were measured in
plasma, and food frequency questionnaires were administered upon enrollment
between 1993 and 1997. Over a twelve year follow-up period, 423 men and 312
women developed diabetes.
Analysis of the data revealed a strong protective effect of high vitamin C levels against diabetes. Participants in the top 20 percent of plasma vitamin C had a 62 percent lower adjusted risk of developing diabetes compared with those in the lowest fifth. Fruit and vegetable intake also emerged as protective. Those whose intake was in the top fifth had a 22 percent lower
diabetes risk than subjects whose intake was lowest.
To the authors’ knowledge, the study is the first to examine the association of plasma vitamin C and the development of diabetes. The findings suggest that suboptimal levels of vitamin C are present before the onset of the disease.
Increased oxidative stress, defined as an imbalance between reactive oxygen species levels and antioxidants, can result in
glucose metabolism disturbances and elevated blood sugar. The authors write that the abundant phytochemicals, minerals
and vitamins, including vitamin C, in fruit and vegetables have antioxidant properties that may be responsible for the protective
effect against diabetes observed in the current study. Additionally, individuals whose fruit and vegetable intake is greater tend
to have lower levels of obesity, which is a strong risk factor for diabetes as well as a promoter of oxidative stress.
“The strong independent association observed in this prospective study, together with biological plausibility, provides
persuasive evidence of a beneficial effect of vitamin C and fruit and vegetable intake on diabetes risk,” the authors conclude.
“Because fruit and vegetables are the main sources of vitamin C, the findings suggest that eating even a small quantity of fruit
and vegetables may be beneficial and that the protection against diabetes increases progressively with the quantity of fruit and
vegetables consumed.”

Several preclinical studies evaluated vitamin C’s role during
mild oxidative stress. The aqueous humor of the eye provides
surrounding tissues with a source of vitamin C. Since animal
studies have shown that glucose inhibits vitamin C uptake,
this protective mechanism may be impaired in diabetes (Corti
A et al 2004).
Supplementation with antioxidant vitamins C and E plays an
important role in improving eye health (Peponis V et al 2004).
High vitamin C intake depresses glycation, which has
important implications for slowing diabetes progression and
aging (Krone CA et al 2004).
Vitamin C, through its relationship to sorbitol, also helps
prevent ocular complications in diabetes. Sorbitol, a sugar-like
substance that tends to accumulate in the cells of people with
diabetes, tends to reduce the antioxidant capacity of the eye,
with a number of possible complications. Vitamin C appears
to help reduce sorbitol buildup (Will JC et al 1996).
Vitamin C also has a role in reducing the risk of other diabetic
complications. In one clinical study, vitamin C significantly
increased blood flow and decreased inflammation in patients
with both diabetes and coronary artery disease (Antoniades C
et al 2004). Three studies suggest that vitamin C, along with a
combination of vitamins and minerals (Farvid MS et al 2004),
reduces blood pressure in people with diabetes (Mullan BA et
al 2002) and increases blood vessel elasticity and blood flow
(Mullan BA et al 2004).


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