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mg22429905_300-1_300It could be the biggest killer you’ve never heard of: the weakening and loss of muscle that happens as we get older. Muscle loss is no longer seen as just a side effect of disease and frailty – it’s also a prime cause. As well as contributing to falls, muscle loss has serious knock-on effects on metabolism (see “life-saving muscle”). In future, muscle-boosting drugs could aid those unable to maintain muscle mass through exercise such as weight training. Although researchers stress this isn’t about bodybuilding, but keeping muscles in your limbs at a healthy level. At New Scientist