When nearly all animals use fat as their primary source of fuel, why do dietary guidelines advise a diet based on carbohydrates for human beings?

Question

Apparently even cows, who eat grass, synthesize fats in their rumen. I could be wrong. Looking for some clarity on this subject. Thanks!

In: Biology

Answer 1

Fat is used for long term storage of energy while carbohydrates is the primary source of energy in all animals. Excess carbohydrates is converted into fat and when the carbohydrate levels are low fat is converted back into carbohydrates so it can be used. The problem is that carbohydrates is very hard for animals to store.