Not long ago, it was assumed that if a restaurant sold smoothies, the most popular flavor would be strawberry–banana, two popular fruits that go well together and give consumers a sense of wellbeing. That was true at Tropical Smoothie Café, whose strawberry–banana Jetty Punch smoothie long reigned as the top menu item at the chain, which currently has around 380 units. But now its top seller is the Island Green smoothie, which combines spinach and kale with mango, ...

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