Why after i eat sometimes does food come back up when i burp?

Reflux: Probably from reflux when the valve between the stomach and food pipe does not hold the stomach contact back. This is worsened by weight gain and large meals.

Reflux.: Gastroesophageal reflux is common, especially after a heavy meal, or after eating fried foods, fatty foods, chocolate, or when you are overweight/obese. Certain medical conditions also predispose to such symptoms, e.g. Sliding hiatal esophageal hernia, gallstones, gastritis, peptic ulcer disease. Please see your family physician if this is frequent, recurring symptom, as it can lead to serious dz.