Eli Lilly says participants in a sizable trial of retatrutide lost much more weight compared to other weight-loss drugs Eli Lilly says participants in a sizable trial of retatrutide lost much more weight compared to other weight-loss drugs A new weight-loss drug has helped participants in a sizable trial lose much more weight than other obesity drugs already on the market – up to an average of 28% of their body weight – Eli Lilly announced on Thursday. The Indiana-based pharmaceutical company