For most of human history, the only available grease was animal fat. Grease is necessary for the intestines to work smoothly and countless other functions.
Vegetable Oils and butter are a relatively recent invention
? look it up: Origin of butter
Butter’s origins go back about 10,000 years to the time when our ancestors first began domesticating animals. Today, butter in its many flavorful forms is the world’s most popular fat.