Indra Nooyi, the boss of PepsiCo, wants her firm to be “seen as one of the defining companies of the first half of the 21st century”, a “model of how to conduct business in the modern world.” More specifically, she argues that Pepsi, which makes crisps (potato chips) and other fatty, salty snacks as well as sugary drinks, should be part of the solution, not the cause, of “one of the world’s biggest public-health challenges, a challenge fundamentally linked to our industry: obesity.”