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In the second episode of our listener questions special, Ian Sample tells Madeleine Finlay what he has uncovered about who the exercise guidelines were created for and whether they apply to all of us, which exercises are best for keeping us strong, whether we should be eating particular foods when we exercise, and how much protein we need to consume if we’re packing in the hours at the gym. With contributions from Jason Gill, professor of cardiometabolic health at the University of Glasgow; Benjamin Wall, professor of nutritional physiology at the University of Exeter; Clyde Williams, emeritus professor of sports science at Loughborough University; Victoria Taylor, head of clinical support at the British Heart Foundation and I-Min Lee, professor of medicine at Harvard Medical School. Help support our independent journalism at theguardian.com/sciencepod

We asked for your questions on getting healthy in 2025 and you delivered. In the first episode of our listener questions special, Madeleine Finlay tells Ian Sample what she has uncovered about the scientifically proven ways to cut down on sugar, the truth behind the panic over seed oils, and why it is that some of us seem to have bullet proof immune systems, while others succumb to every bug they encounter. With contributions from Wendy Wood, provost professor emerita of psychology and business at USC Dornsife, John Trowsdale, emeritus professor of immunology at the University of Cambridge and Katherine Appleton, professor of psychology at Bournemouth University. Help support our independent journalism at theguardian.com/sciencepod

Ian Sample speaks to Keon West, a professor of social psychology at the University of London, whose new book, The Science of Racism, explores what science can reveal about racism, the inventive methods scientists have used to study it and the scientifically proven ways of tackling racism and discrimination. Help support our independent journalism at theguardian.com/sciencepod