Reading in dim light won't damage your eyes, you don't need eight glasses of water a day to stay healthy and shaving your legs won't make the hair grow back faster.These well-worn theories are among seven "medical myths" exposed in a paper published in the British Medical Journal, which traditionally carries light-hearted features in its Christmas edition.
Two US researchers took seven common beliefs and searched the archives for evidence to support them.
Despite frequent mentions in the popular press of the need to drink eight glasses of water, they found no scientific basis for the claim.
The complete lack of evidence has been recorded in a study published the American Journal of Psychology, they said.
The other six "myths" are:
- Reading in dim light ruins your eyesight
- Shaving makes hair grow back faster or coarser
- Eating turkey makes you drowsy
- We use only 10 per cent of our brains
- Hair and fingernails continue to grow after death
- Hair and fingernails continue to grow after death
- Mobile phones are dangerous in hospitals
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