They were developed as diabetes drugs, then their potential to promote significant weight loss became apparent. And now, study after study seems to indicate that drugs like Ozempic and Wegovy can have all sorts of health benefits, leading some scientists to hail a breakthrough that could reverse many chronic diseases of aging. But what is the mechanism for these effects and are they caused by more than weight loss? The Guardian’s science correspondent Nicola Davis tells Madeleine Finlay what is known so far
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