There's a reason (well actually, many reasons) why lentils are considered one of the world's healthiest foods. With 13 grams of protein and 11 grams of fiber per serving, this legume—another member of the pulse family—will keep you feeling full for hours in between meals. They're a great source of fat-burning resistant starch, too, with 3.4 grams in a half-cup serving.
Steel-cut and rolled varieties of oats have up to 5 grams of fiber per serving, making them the most filling choice. (Instant oats contain 3 to 4 grams per serving—if you're opting for that kind, make sure to skip the versions with added sugar.) And as a complex carb, they can help with weight loss. "Your body needs to break down complex carbohydrates because they’re a complicated mesh of molecules,” Lauren Harris-Pincus, M.S., R.D.N., and owner of Nutrition Starring You, told SELF in a previous article.