MEGAN ROSSI, PhD, RD, The Gut Health Doctor, is one of the most influential gut health specialists internationally. A practicing dietitian and nutritionist with an award-winning PhD in gut health, she is also a leading research fellow at King’s College London, where she is currently investigating nutrition-based therapies in gut health, including pre- and probiotics, dietary fibers, plant-based diversity, the low-FODMAP diet, and food additives. She is also the founder of The Gut Health Clinic, where she leads a team of gut-specialist dietitians who see clients all over the world. She is a Daily Mail contributing columnist, a two-time instant Sunday Times–bestselling author, and one of Business Insider’s Top 100 Coolest People in Food & Drink. She lives in London, England.