As a kind of adrenoceptor agonist, "lean meat powder" was discovered by Americans in the early 1980s and was added to animal feed. After 10 to 20 days, it can significantly promote animal growth and increase the lean meat rate. However, "lean meat powder" hides a deadly threat. If the dosage is large, the usage time is long, and the metabolism is slow, the residue in the animal's body will be very large. If you eat meat containing "lean meat powder" residue, it will gradually poison the human body. The lack of business ethics among some breeders has caused "lean meat powder" meat to make a comeback many times, making it difficult to suppress. Recently, "lean meat powder" meat poisoning incidents have been reported frequently across various places, and disillusioned people believe: "The water here is too deep, vegetarianism is best."