Some Medical common beliefs are utterly untrue, while others have no evidential proof....Researchers from the Indiana University School of Medicine in Indianapolis found no evidence supporting the need to drink
eight glasses of water a day. Studies suggest that
adequate fluid intake is often met by drinking juice, milk, and even caffeine-rich tea and coffee. Data also suggests drinking
excessive amounts of water can be dangerous.
The belief that we only use
10% of our brains appears to be completely untrue. Studies of patients with brain damage suggest that damage to almost any area of the brain has specific and lasting effects on mental, vegetative and behavioural capabilities. Brain imaging studies also show that
no area of the brain is completely silent or inactive.
And the belief that
hair and fingernails continue to grow after death may be an
optical illusion caused by retraction of the skin after death. The actual growth of hair and nails requires a complex interplay of hormonal regulation not present after death.
Again, illusion may be to blame for the
belief that shaving hair causes it to grow back faster, darker, and coarser, report author Rachel Vreeman told the BMJ. The stubble resulting from shaving grows out without the finer taper seen at the ends of unshaven hair,
giving the impression of thickness and coarseness.
Again, expert opinion is that reading in
dim light does not damage your eyes. And there is
little evidence to support the banning mobile phones from hospitals on the basis of electromagnetic interference.
ConclusionDr David Tovey, editor of Clinical Evidence journal, said: "The difficulty is it is often hard to disprove a theory.
"On the flip-side, absence of evidence does not necessarily mean absence of effect.
"Where reliable evidence becomes really important is in helping people make serious decisions about harms and risks.
"Many of these 'myths' are innocuous. However, we are still finding evidence that runs contrary to current practice and what we expect."
He gave the example of the relatively recent U-turn in advice over sleeping positions for babies to cut cot deaths.
Experts now recommend babies are positioned on their backs when sleeping to reduce the risk of sudden infant death.
Adapted from bbc.