Not just meat, but veggies as well, would get a huge boost from looking at protein per calorie. In terms of available calories, vegetables are often very protein rich, especially the dark leafy ones, but they are also packed with water and indigestible fiber. Nobody is going to eat 2000 calories of spinach, but when spinach is on your plate you shouldn't look at it as hurting your protein intake. Also a chart based on calories that had lines down the middle for suggested protein intake and suggested intake for bodybuilding would reveal that most whole foods that aren't fruit are completely adequate, the only reason you'd ever have to eat a lot of the highest protein per calorie foods is if a large portion of your diet was refined sugars or oils. Supplementing your Oreo addiction with chicken breast is not a good way to think about a balanced diet.