By Lucia Kassai Bloomberg News March 13, 2012 Diogo Ribeiro da Luz, visiting a missionary friend in the heart of the Amazon three years ago, stepped into a banana-leaf tent to be greeted by a tribesman covered in red body paint asking if he wanted a cup of coffee. The surprise offer from the remote rainforest tribe, where the drink was never traditionally consumed, reflects rising demand across the country, said Luz, who runs Sao Paulo-based coffee roaster Cafes Bom Retiro Ltda. Brazil may overtake the U.S. as the world’s largest consumer of the bean in two to three years, according to Marcos Pinta Gama, Brazil’s permanent representative to international organizations in London. Accelerating economic growth has made espressos and premium-blend coffee drinks from companies such as Starbucks Corp. (SBUX) more affordable to the country’s expanding middle class. The number of coffee shops in Sao Paulo, the country’s largest city, doubled in 15 years to 25,000, Luz said,...