Protein, as we all know has an important function in a bodybuilders diet. I try to get 200gr. a day in 6 small meals. While carbs and fats play an important role in muscle fullness and cell reproduction, protein has many jobs to do before it's used up as energy. Repairing cells or as they say, the building blocks of muscle. It also repairs wounds, helps vision, hair, skin and just about any other organ in your body.
Their are many debates on the subject, but as stated above protein nowdays is cheap. Why take a chance when 1 lb. per lb., which also takes into account for lean mass and fat, has been the basic tool in measuring protein intake for weight training athletes since supplements became OTC in 95. More studies have been done on protein in the last 10 years than in the hundreds of years that protein has been available and studied.
If I go under 200gr or miss a meal, I loose a lb, and I know it's lean. Same thing if I overdue it with carbs or fats, I gain a lb. and I know it's junk. It's a science, but not an exact science, meaning what will work for 1, won't necessarily work for someone else. Experiment and find our just how much protein, carbs and fats your body needs beyond its BMR. That, I found out is the only way in determining how much of each nutrient you need.