Humans require either carbohydrates or fat, as consuming only protein can lead to problems like 'rabbit starvation'.

“The animals we have on the earth now are not very fatty and as you know the fat is pretty important well either fat or carbohydrates are pretty important to human nutrition and think of those nutrients is kind of you know one or the other or both are pretty essential we can't just eat protein this is rabbit starvation and it doesn't work”

“give you enough fat but to me it seems like in nature the critical nutrients are carbohydrates and fat so we know that we need one or the other or we're going to get into big problems we're gonna get rabbit starvation and overconsumption of protein”

“it's called rabbit starvation because rabbits are so lean if you only eat rabbits or squirrels or small rodents you will die because you need fat and carbohydrates in addition to the protein in order for human biochemistry to work”

“the idea with rabbit starvation is this if humans eat only protein or a certain amount of protein without enough fat and or carbohydrates we do get hyper aminemia we get high amounts of ammonia in the blood which leads to essentially starvation in the setting of protein”

“you have to eat a whole lot of protein without eating fat or carbohydrates to get rabbit poisoning”

“the fascinating thing about human physiology is we die without carbohydrates or fat we die we know this this is protein you know this is rabbit starvation this is protein excess protein toxicity”