date:Oct 26, 2012
he said in an email, this type of study cannot prove cause-and-effect.
What's more, past studies have so far come to conflicting findings on whether green-tea drinkers really do have lower cancer risks. All of those studies are hampered by the fact that it's hard to isolate the effect of a single food in a person's diet on the risk of cancer.
Really, the only types of studies that can give strong evidence of cause-and-effect are clinical trials, wherein people would be randomly assigned to us