Seven Great Medical Myths

I came across this article that exposed some common medical myths, I have to admit that the turkey one I'm still suspicious about.

Drink at least eight glasses of water a day

This advice derives from a 1945 recommendation that adults should consume 2.5 litres of the stuff daily, or one milliliter for every calorie consumed. The crucial part of the recommendation – "most of this quantity is contained in prepared foods" – is often ignored. Drinking too much water can be dangerous.

Reading in dim light ruins your eyesight

It causes eye strain, difficulty in focusing and dries the eyes because of reduced blinking while squinting but there is no evidence it causes lasting damage.

We only use 10 per cent of our brains

Studies of patients with brain damage suggest damage to any area of the brain has lasting effects. Brain imaging studies have shown no area of the brain is completely inactive and despite "detailed probing" the non-functioning 90 per cent has not been located.

Hair and fingernails continue to grow after death

They don't. It is an illusion caused by the dehydration of the body which results in the skin retracting. This gives the appearance of increased length to the hair and nails – actual growth requires hormonal regulation which is not sustained after death.

Shaving causes hair to grow back faster or coarser

Shaved hair lacks the finer taper seen at the end of unshaved hair. It has also not been lightened by the sun, so it appears darker.

Mobile phones are dangerous in hospitals

Many hospitals still ban them, despite the lack of evidence that they interfere with electronic equipment, except in rare instances and at close quarters. Technological improvements have reduced the risk further.

Eating turkey makes people drowsy

This myth is based on the assertion that turkey contains high amounts of tryptophan, an amino acid involved in sleep. But turkey contains no more than chicken or beef. Its sleep-inducing effects are due to the quantities eaten.