How To Choose The Healthiest Salad Greens

07/02/2012 10:38 am ET | Updated Sep 01, 2012

Headed to a hoppin' salad bar for lunch? Chances are there will be handfuls of fresh greens up for grabs, from romaine and iceberg to spinach and red leaf lettuce. But when it comes to choosing the healthiest salad base, which types of lettuce pack the biggest nutritional punch?