29 Grass-Fed Beef

In addition to being leaner and lower in calories than conventional cuts, grass-fed beef offers a host of benefits, from muscle-building to fat-burning to heart protection. You can add assistance in the bedroom to its list of good qualities; it’s an excellent source of Vitamin B12. A recent report from Harvard University highlighted a study that has linked low levels of B12 to erectile dysfunction. So, eat up! Bonus: It’s one of the healthy fats that actually makes you skinny.