Via a Google Reader shared item from Patri Friedman titled Vitamin C Abolishes Endurance Training Effects. The post is just a synopsis of a study that demonstrated that Vitamin C has a negative impact on training for endurance. That we should be training for endurance at all is a topic often derided by various paleo gurus, but the somewhat tangential snippet below is what really caught my eye. It immediately makes me wonder, how much Vitamin C should we be consuming in our diets? Fruits and vegetables are frequently touted as the end-all be-all of nutrition, but most all of those foods have a lot of Vitamin C, which is an antioxident we arguably don’t need much of.
A mere cup of chopped broccoli has 135% of the daily recommendation, which is 90 mg, so 120 mg (Vit C rec. info). And who eats just a cup of broccoli? Further, what about all the other sources we’d get C from in a day?
Who would have thought maybe the colorful fruits and veggies are actually harming our health? Maybe Peter at Hyperlipid has it right. It’s worth further investigation.
Here’s the bit from the Mangans blog:
As noted before on this blog, glutathione is by far the most important antioxidant, and it’s made internally from amino acids. Other antioxidants, as can be seen here, can hamper its production.
Our paleolithic ancestors would probably have been ingesting only small amounts of vitamin C, so any dose larger than say, 100 mg, must be considered quite unnatural. That is not to say that megadoses of vitamin C may not be useful in certain medical conditions, but overall it seems best to avoid that. Many holistic practitioners recommend doses of several grams a day, which could be positively harmful to health. At the least, we can say that athletes should take small doses if any.