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Here's a piece from Racked that takes an in-depth look at how nutrition bars are marketed mainly towards women (hint: by using plenty of stereotypes). Originally, nutrition bars were meant to fuel workouts, but that changed with the invention of the Luna bar, which was "designed specifically" to cater to females. Over the years, they have transformed to become a tool to help women remain trim, and the bars are now formulated "in pursuit of what [companies] believe women want: Dessert minus the hypothetical pounds."