The sirloin steak is a cut from the animal's back. Actually, there are several different kinds of steak made from the sirloin.
Sirloin is a complete protein because it contains all nine essential amino acids. This macronutrient is crucial for immune system health, muscle development, and cell regeneration. Moreover, protein has a satiating impact that keeps you fuller for a longer amount of time, which is advantageous if you're trying to lose weight.