Drinking 500ml dark roast coffee brew had 23% reduction in DNA damage after 4 weeks.
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The study comprised two periods of 4 weeks: a preconditioning period, with daily consumption of at least 500 ml water but no coffee, nor tea, nor any other caffeine-containing product.
I think that I would break more than just a few DNA strands before that month was finished.
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I hope the effects of those 500 mL portions are additive. >100% reduction in DNA damage over here. 
Must drink more coffee. Also could be an important defense against dementia.
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Who was that study funded by, I believe they charge to publish articles.
Anyway off to drink a nice cup of tea.