Cereal sales in the U.S. have been sluggish for some time now, given the ever-expanding number of breakfast options including Greek yogurt, egg sandwiches and even waffle tacos from fast-food chains. The movement away from calorie counting in the dieting world, for instance, has hurt Special K, which over the years had expanded to include everything from snack bars to crackers to frozen waffles. In a phone interview, Kellogg CEO John Bryant noted that people are now more interested in foods that provide nutritional benefits, rather than those that simply keep their calorie counts down. The maker of Special K, Pop Tarts and Pringles lowered its outlook as a result, saying it now expects core sales for the year to decline slightly.