This is from the British Medical Journal. The journal actually did a study on medical myths that even many doctors believe. Here are the top seven that the BMJ says aren’t true, and you won’t like some of them.

1. Drink eight glasses of water each day — The journal says there’s no evidence supporting the recommendation. Any liquid helps hydrate you, says the journal, even coffee.
2. People only use 10 percent of their brains — People use a lot more than 10 percent. Evidence is that brain injuries can cause more impairment than 10 percent would warrant, and imaging shows no area of the brain is inactive.
3. Hair and fingernails keep growing after death — In fact, the illusion is because as the body dehydrates, the skin retracts from fingernails and hair.
4. Shaving causes your hair to grow back faster, darker or thicker — Shaving has no effect on new hair growth. New hair sometimes appears darker because it has not yet been lightened by the sun or other chemical exposures.
5. Reading in dim light ruins your eyesight — Reading in dim light can cause eye strain, but no permanent damage.
6. Eating turkey makes you especially tired — Turkey doesn’t contain enough tryptophan, an amino acid, to cause excessive drowsiness. Chicken, beef, port and cheese contain as much, and sometimes more than turkey. It’s more likely that when people overeat turkey during the holidays, they blame their drowsiness on tryptophan.
7. Cell phones cause significant electromagnetic interference in hospitals — While many hospitals banned cell phones, nothing credible has found a cell phone signal interfering with hospital equipment.