The microbes in our guts help maintain our immune systems and overall health. Awareness of this link continues to gain ground in the wake of COVID-19. But how can we feed our ‘good’ gut microbes? This is an especially important question as we age, and the diversity of our microbiome naturally declines. Join us as we profile approaches to gut health, from fermentation to fibre, pre- and probiotics to polyphenols, and whole-to ancient grains.