In the aisles of the American supermarket, hierarchies arise and collapse with the velocity of soap-opera drama. The produce section is especially cutthroat; here, because novel products are so rare, it's the stories that must change to entice consumers. Back in the 1970s, the Chinese gooseberry went global - cultivated in New Zealand and shipped to the world - after being rechristened as the friendlier kiwi. Just a few years ago, kale was king, rehabbed as a luxury green after decades as a garnish and a Southern standby. Similarly, quinoa, long a staple crop in the Andes, has lately become a Western fixture, an ostensibly more primal alternative to rice. The latest entrant to this contest is Brazilian açaí, a purplish, antioxidant-rich stone fruit — though most call it a berry — foraged from trees in the Amazon River basin.

On an April Monday in Sherman Oaks, Calif., the Harvest Bar was packed with adults in athleisure, eating puréed açaí from bowls the size of flowerpots. The restaurant is a fast-casual “superfood cafe,” one in a growing class of health-food restaurants doing brisk trade in the açaí-bowl business, selling heaps of the puréed berries topped with diced fruit and other sweets. “The blend is like an ice cream,” the owner, Aric Haut, explained. “But healthy.” More than 5,000 miles to the south, harvesters in the Amazon basin of Brazil climb palm trees to pick the wild-growing fruit. What lies between these two distant parties is the latest unspooling of the food-fad plot — a supply chain driven by remarkable health claims, with money exchanged at every step along the way.

In the Amazon River basin, açaí — pronounced “ah-sah-EE” — has been eaten since at least the dawn of written history. The fruit, until the 1970s, was constrained to just this region, where local ribeirinhos, or “river people,” plucked it from trees and ate it as part of nearly every meal. As a weak jungle economy pushed ribeirinhos into cities, their gradual migration formed a distribution network. At first, they sold açaí from makeshift roadside carts. By the ’80s, they were shipping it to Rio and São Paulo, where it gained a reputation as prime fuel for jiu-jitsu. High in omega fats and low in carbohydrates and sugar, its sweet and earthy flesh is filling yet light. By the ’90s, Brazil had an açaí-bar scene. As the berry gained status, its price began to rise.

If the superfood plot were a bit more predetermined, you might expect açaí to go the way of quinoa.

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