Not all protein is equal

Ultra-processed whey is not the same as salmon, either in nutrition or in the experience of eating it. Salmon will be high in omega-3 fatty acids and vitamin B12, whereas whey protein is low in vitamins, most minerals and fat-free.

Many view vegetable proteins such as lentils and peas as "low quality" compared with meat, eggs, and dairy, even though they contain all essential amino acids in smaller amounts. With a varied diet, this shouldn't matter.