New research shows that popular beliefs, such as drinking eight glasses of water a day leads to good health and that people only use 10% of their brains, are untrue.
A report published in the British Medical Journal (BMJ) suggests that they are actually no more than "medical myths".
Researchers in the US examined data supporting a host of claims only to find that they are often unproven, untrue or simply illusions.
They could find no proven backing for 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 caffeinated beverages such as coffee and tea.
And there is also clinical evidence which points out that drinking excessive amounts of water can actually be dangerous.
The belief that we use only 10% of our brains was also refuted by studies of patients with brain damage.
Analysis suggested that damage to almost any area of the brain has specific and lasting effects on mental, vegetative, and behavioural capabilities.
And the authors said that brain imaging studies have also shown that no area of the brain is completely silent or inactive.
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British Medical Journal
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