Once you pop the top of a tube of potato chips, it can be hard to stop munching its contents. But Cornell researchers may have found a novel way to help: Add edible serving size markers that act as subconscious stop signs. Researchers from Cornell's Food and Brand Lab, led by Brian Wansink, served tubes of Lays Stackables, some of which contained chips dyed red, to nearly 100 students. The experiment found that adding colored potato chips helped subjects eat fewer chips and accurately keep track of what they had eaten.