Are all narcissists pathological liars?

Pathological lying is one of the hallmark characteristics of a narcissist. They lie out
of their need to manipulate and control. They must lie in order to create their false "reality" about themselves that they project out to the world.

Each gram of carbohydrates and proteins yield 4 calories / gram . the more the calories a food has the more energy it provide to you body.

Yes, this is very true. specifically causing damage in the  dentrite.