[robotchampion]

@Derleth - thx for asking. Here is one source, the Harvard School of Public Health:

(intro)...Surprisingly little is known about protein and health...

(from the section: Protein Package)

Animal protein and vegetable protein probably have the same effects on health. It's the protein package that's likely to make a difference.

A 6-ounce broiled porterhouse steak is a great source of complete protein—38 grams worth. But it also delivers 44 grams of fat, 16 of them saturated. (2) That's almost three-fourths of the recommended daily intake for saturated fat. The same amount of salmon gives you 34 grams of protein and 18 grams of fat, 4 of them saturated. (2) A cup of cooked lentils has 18 grams of protein, but under 1 gram of fat. (2)

The bottom line is that it's important to pay attention to what comes along with the protein in your food choices.