Fast-food chains are trying to put healthier choices on the menu, but the moves may be pushing consumers to order more high-calorie, high-fat indulgences, according to research by Duke University consumer psychology professor Gavan Fitzsimons. "When you put a healthy option up there on an otherwise unhealthy menu, not only do we not pick it, but its presence on the menu leads us to swing over and pick something that's worse for us than we normally would," Fitzsimons says.

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