Why is fast food so popular? Because it can meet the needs of the people. Chinese food is delicious, but people need about an hour to prepare a meal. It is really difficult to spend so much time cooking because of work or study. Fast food is very cheap. Usually, people only spend about ten yuan on fast food, vegetables and meat.
But fast food is unhealthy. In order to make it delicious, people usually put a lot of oil in vegetables and meat. So we shouldn't eat too much.