The document discusses the post gastrectomy diet for gastric bypass surgery. It provides an overview of the diet, noting that it changes over time based on how long after surgery a patient is. The diet is heavily based on protein needs and consists of small portions over 3 meals a day. Examples are given of how the diet changes from clear liquids and full liquids in the first few weeks to soft foods and regular foods after 2 months. Guidelines are listed for appropriate portion sizes and types of foods at each stage of recovery.