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A US study showed that men with low testosterone levels had a significantly increased risk of dying prematurely - of any cause. How much of a man you are may be linked to how old a man you'll be. There's evidence that having a low testosterone level isn't good for your health and to test this idea, US researchers looked at what happened to nearly 900 blokes who'd had their testosterone levels measured a couple of times over a period of up to eight years. Those with low testosterone levels had a significantly increased risk of dying prematurely - of any cause. Now, there are reasons why a man might have a low testosterone, one of which is he's been sick. So the researchers tried to allow for acute illness and the relationship with earlier death persisted. This was not a perfect study, since the men were not necessarily typical of males in the general population and it doesn't say that a low testosterone kills you. It could be a marker for something else. It's more another clue in the puzzle of ageing rather than a reason to rush out and get doped up as if you were going in for the Tour de France.
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