Eating fat and losing weight is a dialect in southern China. It means: I went to a far away place and ate so-called delicious food. I should gain weight after eating it. As a result, I was very tired because of the long journey, and even got some minor illnesses, but I lost weight.

The word "eat fat and lose weight" is used to satirize gourmets who travel tirelessly because of their delicious food. To put it bluntly, swearing is delicious, and it is right to punish whatever you want to eat.

Nowadays, people make fun of each other more than praise or criticism.

Extended data:

Eating fat and getting thinner means that if you eat too much, you will get fat. If you walk more, you will lose weight. One is the process of eating food, which makes people fat, and the other is the process of eating food, which makes people thin.

This is a very simple truth. If you just can't eat, you will definitely be fatter than those who like sports, because your body consumes less energy.