Gorillas eat veggies but these are converted to fat - they have the digestive system to make this conversion. Converts to 70% fats in energy source
Cows eat grass - but these are converted into fat by their gut bacteria - they consume the bacteria. Cows normally eat no carbs. Converts to 70% fats in energy.
Lion 70% fat too - no carbs
In nature all mammals are designed to eat a high fat diet.