Although a good way to annoy people and lose friends, several studies have shown no evidence that knuckle cracking causes arthritis. Anecdotally, Dr. Donald Unger spent over sixty years cracking the knuckles of his left hand but never his right. He reported no arthritis or other problems in either hand. He earned the Ig Nobel Prize in Medicine for this in 2009!
Drink eight glasses of water a day
Of course hydration is vital but the “drink 8 glasses of water a day” advice seems to have no scientific evidence. It seems to have come from a vague misinterpreted reference in a 1945 USA Food & Health Guidelines. There is much conflicting evidence on how much to drink, but hydration certainly gives our cognition a boost and keeps chronic kidney disease at bay.
Sugar makes children hyperactive
Ok, so sugar should not be central to your child’s diet and after consuming 5 Easter Eggs in two hours, my eldest daughter seemed to bouncing off the walls BUT…a 1996 review of 12 “blinded” studies showed no evidence that sugar makes kids hyperactive. Even more worrying was that the research suggests that “the sugar effect” is all in the parents’ mind. Mmmm…