No Fours diet
As its name implies, the No Fours Diet refers to avoiding food that comes from four-legged land animals such as beef, pork and sheep. It allows for meat from other animals including seafood and poultry.
Proponents of this diet believe that a chemical called sialic acid, thought to be higher in four-legged animal meat, can be unhealthy. Some followers of this diet allow dairy while others avoid it.