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Friday, January 25, 2008

Vitamin C may hamper adaptation to exercise

Another "healthy" food alert!

Sorry for such a long quote, but it has value. Try to make it through the whole excerpt.
"Taking vitamin C can blunt the body's response to endurance training, a new study in humans and rats shows...

The men who didn't take vitamin C showed a 22-percent increase in their body's ability to take up and use oxygen during exercise, compared with just a 10.8-percent increase for the men given vitamin C. Similar results were seen for the rats.

When the animals were forced to run to the point of exhaustion after 6 weeks of endurance training, those that weren't dosed with vitamin C were able to run nearly twice as far as they had before training, while those given the vitamin only increased their distance by 25 percent. Tests on the muscle tissue of the animals found that rats that weren't given vitamin C had added more mitochondria, the "engines" within cells that convert nutrients into energy.The findings suggest that the release of free radicals during exercise helps muscles to adapt by changing gene expression, Vina and his team note, while antioxidants such as vitamin C may interfere with this process. In fact, they add, exercise itself could act as an antioxidant by boosting the body's expression of antioxidant enzymes."

Here's the deal.

It is well-known, except by the experts in diet and fitness, that the body produces free radicals from training.

You read that right. The body makes free radicals normally.

The body also has its own mechanisms for dealing with them.

It is plausible that the anti-oxidants you take interfere with what the body prefers to do.

"Healthy" food?

The experts don't know squat.

But you can eat healthily.

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