A gastrectomy is the surgical removal of part or all of the stomach. It is often performed to treat stomach cancer, severe ulcers, or obesity. A partial gastrectomy removes only a portion, while a total gastrectomy removes the entire stomach, requiring significant lifestyle changes post-surgery.

Weight lost refers to the reduction in body weight that is typically achieved through lifestyle changes, medications, or bariatric surgeries like the RNY or gastric band. Weight loss, particularly significant or rapid weight loss, can have dramatic positive effects on a person's overall health, reducing the risk of heart disease, diabetes, and other obesity-related conditions. Successful weight loss usually requires long-term changes to diet, exercise, and behavior.

Bariatric relates to treatments aimed at weight reduction, especially in individuals with severe obesity. This includes medical, surgical, and behavioral interventions. Bariatric surgery, such as gastric sleeve or bypass, is often a last resort for those who have struggled with losing weight through traditional methods.

After a stomach bypass (gastric bypass) surgery, patients must follow a strict diet to promote healing and sustain weight loss. This typically starts with liquids, then progresses to pureed and soft foods, eventually allowing small, nutrient-dense meals. Long-term dietary adjustments are crucial to prevent complications like dumping syndrome.