In this myth-busting interview, genetic epidemiologist Tim Spector upends conventional diet advice with the latest science from the gut microbiome. He explains why calorie counting and one-size-fits-all diets often fail, revealing instead how our unique gut bacteria and food choices determine our weight and metabolic health. Tim shares actionable tips like “eating the rainbow” of plants to feed diverse gut microbes, time-restricted eating, and why upping your fiber (not just cutting calories) can be a game-changer for weight loss and longevity. This eye-opening episode will change the way you think about food and dieting.