In daily life, it is not usually necessary to make the stomach smaller. Some patients with excessive obesity, diabetes, stomach cancer, etc. may need to make their stomachs smaller, which can be done by eating less and eating more, or by surgical resection. It is recommended to do it under the guidance of professionals to avoid adverse consequences. 1. Eat less and eat more: The stomach is a stretchy organ, and some overweight and diabetic patients need to make dietary adjustments for the sake of their health. In daily life, if you change your dietary habits into eating less and more meals, then each time the stomach needs to digest and hold less food than before, which may make the stomach shrink smaller to a certain extent. 2. Surgical resection: For patients with stomach diseases such as stomach cancer, the treatment may need to remove part of the stomach through partial gastrectomy, which will make the stomach smaller. It is recommended to go to regular hospitals for symptomatic treatment to avoid adverse consequences.