Fraud, negligence, misguided good intentions combined with poor study design, intellectual conformity… these are among the problems plaguing research.
A couple of links as examples:
- Possible fabricated evidence in Alzheimer’s research.
- A chemical imbalance theory of depression, pushed for years by many psych professionals and the media, doesn’t have much evidence to back it up. (By the way, if you’re currently on antidepressants, please discuss any concerns with your doctor and don’t just abruptly stop taking them. That itself could be harmful.)