Too few studies have large enough samples to support generalized conclusions.
When studies are replicated, they rarely come up with the same results. Only a third of the 100 studies published in three top psychology journals could be successfully replicated in a large 2015 test.
Medicine, epidemiology, population science and nutritional studies fare no better, Ioannidis said, when attempts are made to replicate them.
Pressure on researchers, competition between journals and the media's insatiable appetite for new studies announcing revolutionary breakthroughs has meant such articles continue to be published."The majority of papers that get published, even in serious journals, are pretty sloppy,"
"Diet is one of the most horrible areas of biomedical investigation."
A famous 2013 study on the benefits of the Mediterranean diet against heart disease had to be retracted in June by the most prestigious of medical journals, the New England Journal of Medicine.
Bad studies have contributed to the adoption of treatments that are at best ineffective, and at worst harmful.
Edited by Rogerdodger, 06 July 2018 - 09:00 AM.