Protein provides the building blocks of skeletal muscle via their constitute amino acids. There are a number of different types of protein available and there are as many more variables to consider when selecting proteins including quality, digestion rate and source.
Complete proteins contain all 20 amino acids and these are made up of 9 essential amino acids (EAAs) and 11 nonessential amino acids (NEAAs). EAAs cannot be produced by the body and must be gained through ones diet. Of the EAAs, 2-3 grams of leucine is required to optimize protein synthesis. There are a number of different ways to determine protein quality and these include chemical score, protein efficiency ratio, biological value and the most commonly used protein digestibility-corrected amino acid score (PDCAAS).
This brings us to the various types of protein available. There are plenty around and some of these include milk based protein, egg based protein, meat protein and plant based protein sources.