Jell-o salads used to include meat for a variety of reasons. First, Jell-o was originally marketed as a health food and was thought to be beneficial for the digestion. including meat in the salad helped to add protein and other nutrients to the dish. Additionally, meat helped to give the salad a more substantial and filling quality, making it a more satisfying meal. Finally, the gelatin in Jell-o helped to keep the meat moist and tender, making it more palatable. Over time, however, the popularity of Jell-o salads declined and the inclusion of meat became less common.