Nutri-Grain bars are the number one selling cereal bar. Last year alone, Kellogg’s sold nearly 40 million boxes of these bars which is approximately 113 million dollars in sales. That’s a lot of cereal bars! The packaging looks health-friendly and by gosh, it has “fruit filling” — what could be wrong with that? Well before you throw any cereal bars in the cart, watch the video below and see what Dr. Axe has to say.