The company behind Pepsi announced it will bring back aspartame sweetener to one of its diet colas, a year after taking it out. Fans complained about the taste of a replacement sweetener called sucralose. The change comes after sales of diet sodas dropped to more than 10 percent in the first quarter of this year. Mark Schatzker, author of "The Dorito Effect," joins "CBS This Morning" to discuss how flavoring and a growing awareness of health effects affects the diet soda sales.

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