Giant pandas only eat bamboo, not meat. The specific reasons are as follows:

1. In the wild, compared with other foods, bamboo is widely distributed and easily available, and few competitors compete with giant pandas for food.

2. Scientists in China have completed the genome sequencing of the giant panda, which supports that the giant panda should belong to a subspecies of Carnivora Xiong Ke. During the evolution of millions of years, it lost a gene named T 1R 1 and has been eating bamboo instead of meat ever since.