Quote:The shift offers a glimpse into the consequences of rising global food prices and changing eating habits in both prosperous and developing nations. While quinoa prices have almost tripled over the past five years, Bolivia’s consumption of the staple fell 34 percent over the same period, according to the country’s agricultural ministry.

The resulting quandary — local farmers earn more, but fewer Bolivians reap quinoa’s nutritional rewards — has nutritionists and public officials grasping for solutions.

“As it’s exported, quinoa is now very expensive,” said María Julia Cabrerizo, a nutritionist at the Hospital de Clínicas, a public hospital here. “It’s not a food of mass consumption, like noodles or rice.”

Quinoa, domesticated thousands of years ago on Bolivia’s arid high mountain plains and now often misrepresented as a grain, is actually a chenopod, related to species like beets and spinach. Its seeds have a light, nutty taste, and when cooked become almost translucent.

Quote:While the Incas relied on quinoa to feed their soldiers, it was only recently that Bolivian farmers, with the help of European and American foreign aid organizations, started growing quinoa for export.

The focus on foreign markets has altered life in isolated places like Salinas de Garcí Mendoza, a community on the edge of the salt flats in southern Bolivia where much of the country’s quinoa is produced. Agricultural leaders claim that rising exports of the plant have lifted living standards there and in other quinoa-growing areas.

“Before quinoa was at the price it is now, people went to Argentina and Chile to work,” said Miguel Choque Llanos, commercial director of the National Association of Quinoa Producers. Now, he said, rising quinoa prices have also encouraged city dwellers to return to their plots in the countryside during planting and harvest seasons.

Yet there are causes for concern. While malnutrition on a national level has fallen over the past few years thanks to aggressive social welfare programs, Ms. Cabrerizo, the nutritionist, said studies showed that chronic malnutrition in children had climbed in quinoa-growing areas, including Salinas de Garcí Mendoza, in recent years.

Quote:In Salinas de Garcí Mendoza and elsewhere, part of this change is due to climbing quinoa prices and more quinoa being destined for export.

“I adore quinoa, but I can’t afford it anymore,” said Micaela Huanca, 50, a street vendor in El Alto, a city of slums above the capital, La Paz. “I look at it in the markets and walk away.”

Officials in President Evo Morales’s government say that changing food preferences and increased ability to buy processed foods also play a role.

“It has to do with food culture, because if you give the kids toasted quinoa flour, they don’t want it; they want white bread,” said Víctor Hugo Vásquez, vice minister of rural development and agriculture. “If you give them boiled water, sugar and quinoa flour mixed into a drink, they prefer Coca-Cola.”

The shift away from consuming quinoa in the cradle of its cultivation has alarmed some of the plant’s top marketers in the United States, where quinoa is increasingly coveted by health-conscious consumers.

“It’s kind of discouraging to see stuff like this happen, but that’s part of life and economics,” said David Schnorr, the president of the Quinoa Corporation of Los Angeles, one of the largest importers of quinoa in the United States, which has worked with Bolivian producers since the 1980s.