Pork sirloin is a good source of protein with a value of 95 grams per serving, but it has 580 calories and 19 grams of fat per serving with 7 grams of fat listed as saturated fat, notes Self. It also has a high cholesterol content of 286 mgs.
Pork sirloin is a low-sodium option that has a variety of other nutrients in it. It is a good source of selenium, phosphorus and vitamin B6. According to the Self nutrition scale, pork sirloin has a rating of almost three stars out of five for weight loss, and two stars out of five for weight gain.