Where's the truth about health and nutrition?

"Studies have found that hormone-replacement therapy is safe and effective, and also that it is dangerous and ineffective; that virtually every vitamin supplement lowers the risk of various diseases, and also that they do nothing for these diseases; that low-carb, high-fat diets are the most effective way to lose weight, and that high-carb, low-fat diets are the most effective way to lose weight; that surgery relieves back pain in most patients, and that back surgery is essentially a sham treatment; that cardiac patients fare better when someone secretly prays for them, and that secret prayer has no effect on cardiac patients. (Yes, these latter studies were undertaken by respected researchers and published in respected journals.)" - David Freedman in Columbia Journalism Review.

http://www.cjr.org/cover_story/survival_of_the_wrongest.php?page=all&print=true