Much medical research is wrong

A Greek named John Ioannidis has been pointing out flaws in medical research for years. Here is a new article about his findings:

Some points made in the article: even the most respected, widely accepted, peer-reviewed medical studies are all-too-often deeply flawed or outright wrong; when an error is brought to light and the conclusions publicly refuted, the erroneous conclusions often persist and are cited as valid for years, or even decades; scientists and researchers themselves regard peer review as providing 'only a minimal assurance of quality'; and these shortcomings apply to medical research across the board, not just to blatantly self-serving pharmaceutical industry studies.

As examples, a lot of the studies behind a lot of dietary recommendations are bogus.