c/o Chris Mohr: Antioxidants were never thought to HURT a person. In fact, just the opposite. Many think they’re THE answer to the fountain of youth … and load up on tons of different pills and potions. From vitamins E and C to resveratrol and lipoic acid, there are dozens of known antioxidants and certainly even more that have yet to be discovered. But what if we told you about new research suggesting supplementing with certain antioxidants may PREVENT the health benefits of exercise? Seriously. This study evaluated the effects of 1000 mg vitamin C and 400 IU’s vitamin E on insulin sensitivity (very simply, how well your body uses insulin). It’s well established that exercise improves insulin sensitivity (which is particularly great for those with diabetes). But when the researchers gave participates the two vitamins, combined with the exercise, they found the same benefit of the exercise was "blocked" by the supplementation. Interesting. Now, this isn’t to say EATING these antioxidants is bad — please do. You can load up on vitamin C by eating a variety of fruits and veggies. Of course they also provide a ton more nutrients than just vitamin C to boot. And some good sources of vitamin E, while more difficult to get from foods, include almonds, wheat germ, sunflower seeds, and many leafy greens. Moral of the Story: Eat your nutrients, rather than trying to find that magic pill or potion. We’re not saying all supplements are "bad" per se, but this study is an interesting one — suggesting that using supplementation with 2 popular antioxidants may negatively effect some of the health-promoting effects of exercise in humans. Of course it’s not the "final" answer on this topic — just another piece to the puzzle.