Ozempic has changed the way we treat diabetes. But it's its ability to aid rapid weight loss that has captured the world's attention.  How will Ozempic change the way we live and interact with the world? Will obesity become a thing of the past? And is this kind of huge change even possible when shortages impact its supply?  Hack unpacks Ozempic with best-selling author Johann Hari, obesity expert Dr Kathryn Williams... and a couple of bodybuilders too. Guests: Johann Hari, author Dr Kathryn Williams, obesity expert, University of Sydney