The main component of fat meat is fat, which will be decomposed into glycerol and fatty acids in the human body. These substances will be absorbed by the human body and stored as fat. So eating too much fat may lead to fat accumulation in the body, thus increasing weight.
However, weight gain is not only due to fat intake, but also includes excessive intake of calories and other nutrients. Therefore, even if you don't eat fat, if you consume more calories than your body consumes, you may still gain weight.
In addition, whether the human body will gain weight is also affected by many factors, including heredity, lifestyle, exercise habits, endocrine and so on. Therefore, even if two people eat the same amount of fat, one person may get fat, while the other person will not.
Generally speaking, although eating fat may lead to weight gain, it is not the only factor, so it cannot be regarded as the only reason. In order to maintain a healthy weight, it is recommended to eat a balanced diet and exercise moderately.