6 Surprising Superfoods

black-lentils
Credit: Melissa Punch

Black lentils

These legumes are loaded with iron: One cup has about 8 milligrams, getting you almost halfway to the daily requirement of 18 milligrams for women. Lentils also boast high levels of soluble fiber, which may not only lower your cholesterol, but could also improve immune function, according to a new University of Illinois study.

Next: Blackberries