Carnivores like lions first eat internal organs like liver & kidney. Apparently these contain a nice mix of fat and protein. Even orcas preying on whales just e

Carnivores like lions first eat internal organs like liver & kidney. Apparently these contain a nice mix of fat and protein. Even orcas preying on whales just eat the liver and leave the rest. Question is why. My brief research after reading this article showed that cats can't produce their own fat or proteins. And are poor in taking energy from carbohydrates. Since they can't get their energy from carbs, they eat fat along with proteins. Say our ancestors couldn't farm. Or were carnivores then it makes sense that they'd seek fat source by instinct just to stay alive. The argument that fat eating made us human is fiction.