Pu 'er tea. Tibet has a high altitude and a cold climate. 10 soldiers drink some pu' er tea, which can warm and nourish the stomach. Moreover, caffeine and flavanol in Pu 'er tea have obvious protective effects on gastrointestinal mucosa and promote digestion. Tibet, referred to as "Tibet". Xizang Autonomous Region, the capital of Lhasa, located in the southwest of People's Republic of China (PRC), is one of the five minority autonomous regions in China.