This pilot clinical trial studies protein-sparing modified fast (PSMF) intervention for weight loss in obese endometrial cancer survivors. The PSMF is a diet that is very low in carbohydrates and calories, designed to induce fast, safe weight loss. The diet consists of only lean meats (beef, pork, poultry, and seafood) in amounts adequate to meet protein requirements based on the individual's body weight. The PSMF may help endometrial cancer survivors achieve significant weight loss, reduce the risk of chronic disease, and improve quality of life.