1) "This tiny nutritional giant fills you up -- not out." - whfoods.com
2)"Magnesium is Nature's own calcium channel blocker. When enough magnesium is around, veins and arteries breathe a sigh of relief and relax... Want to literally keep your heart happy? Eat lentils." - whfoods.com
3)"The optical lens is named after the lentil (Latin: lens), whose shape it resembles." -wikipedia.
Conclusion: Lentils are a stress-reliever and they predate eyes.
So many types, hard to choose just one. Like shoes for your body.

Dedicated to Jacob Kinkler, man who loved lentils.