Why do Chinese astronauts eat black foods blackcurrants in space?

Why Do Chinese Astronauts Eat Black Foods – Blackcurrants – in space?

A Chinese spacecraft blasted into space Saturday, June 16 2012, at the Jiuquan Satellite Launch Center in the western part of the Province of Gansu. The spacecraft carries a crew of three astronauts, including China’s first female in space, Liu Yang. The main spacecraft is set to dock with another spacecraft, which is in orbit