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Michael Mosley examines the powerful new science behind the ancient idea of fasting, as he sets himself the ambitious goal of living longer, staying younger and losing weight without making drastic changes to his life. He tests out the science of fasting on himself and reflects on the life-changing results., Series exploring topical scientific issues. Michael Mosley examines the powerful new science behind the ancient idea of fasting, as he sets himself the ambitious goal of living longer, staying younger and losing weight without making drastic changes to his life. He tests out the science of fasting on himself and reflects on the life-changing results., Presenter Michael Mosley explores fasting.