Steroid use may have a lasting effect on teenagers' brains, a study suggests. US researchers, who looked at the effect of anabolic steroids on hamsters, suggest the drugs 'flip a switch' and trigger lasting aggression.
The effects of steroid may last for at least two years, and cause permanent brain changes, the Behavioral Neuroscience study warns. But a UK expert said it was impossible to state the length of effect in humans, based on a study in hamsters.
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