/sci/ - Science & Math

I have a question that's been bugging me a bit lately. If protein as a nutrient is proteins constructed within the organism that is being consumed that can be broken down into their constituent amino acids, and proteins are universal among complex organisms that anyone could consume. Why is fleshy meat so much more protein rich than say, vegetation? I presume it's likely due to concentration of proteins, but what is the reason behind this difference in concentration of proteins in muscle mass, as opposed to any other tissue, be is plant or animal?