This is an extremely complex debate and I will make quite a few posts on it over time. I thought the following comments from Dr Mercola were quite good, providing an overview of free radicals and antioxidants:
Free radicals are highly reactive molecules that steal electrons from the first thing they encounter, such as a cell wall, or a strand of DNA. The loss of an electron, in turn, oxidizes these cells, which makes them unstable and easily breakable.
As this free-radical damage continues, your cells can no longer perform properly, and hence, tissues begin to degrade and disease sets in.
An interesting point to consider is that it is not unusual that in trying to do a good thing, some supplements could actually harm you. Depending on your clinical circumstances, suppression of free radicals may actually be harmful. It all depends on your specific circumstances.
For more, see the full post at http://articles.mercola.com/sites/articles/archive/2007/10/18/cut-sugar-and-supplements-and-live-15-years-longer.aspx
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