Originally Posted by Bodybygamma
Its nutrition 101, Calories are units/measurements of energy sources in foods for to fuel the body. The big 3 Proteins, Carbohydrates, & Fats is where the body gets fuel.
Protein as fuel is bad since it would be Catabolic since Protein is used to keep muscles functioning, so you only have 2 sources of fuel for energy left. If you reduce one, you must balance out the other, its simple science.
Excellent post BBG I would rep but I'm on my phone,
Great thread BTB this is a topic that people really have a hard time with.