What is the cheapest source of protein in the world?

[Longhorn85]

It's gotta be tuna. If you can find cans at 3 for a dollar, that is almost one cent per gram with no fat or carbs mixed in.

 

[skinnyfat]

My advice would be to go easy on the tuna, even though it's cheap, because then you'll be like me and won't ever want to touch the stuff again. This doesn't happen with egg whites or cottage cheese.

 

[MS]

It entirely depends on what part of the world you live in. Where I live, lamb is cheap and chicken breasts require a second mortgage! On a world scale, soy protein is unquestionably the cheapest.......

 

[anthrax]

Why not buy a hen ?

it will give you eggs first
and when too old for the eggs you will just eat it