One ounce of lean, cooked beef contains 49 calories, meaning that a 12-ounce steak contains approximately 594 calories. This may vary if the steak contains fat or a bone.
The nutritional breakdown per ounce of lean beef includes 18 calories from fat and 31 calories from protein. It's important to note that the recommended serving size for beef is between 3 and 4 ounces, meaning that a steak can represent several times the recommended amount of beef for a given meal. However, opting for leaner cuts can ensure that the maximum benefit is obtained without the need to sacrifice the enjoyment of eating a steak.