Fat is an essential nutrient that has been the primary fuel source throughout human evolution. Before the advent of agriculture around 10,000 years ago humans got their food from hunting, fishing and gathering and as much as 58% of our hunter-gatherer ancestors’ dietary calories came from fat! In fact, the diversity of protein and fats from animal products was what powered our brain’s expansion, without it we would have never had the ability to have an intelligent debate on FAT in the first place.