Africa's Changing Tastes Put Coffee Exports Under Strain

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June 1, 2014 7:32 p.m. ET

KAMPALA, Uganda—At 7:30 one recent morning, Patra Akello, a dentist, joined some workmates for a ritual once rare here: a cup of coffee.

"It's my favorite daily routine," says Dr. Akello, 28 years old.

Ugandans are tea drinkers, though their country exports more coffee than any other in Africa. But times and tastes are...