From my guidelines for eating after surgery, i hope this helps.
You will need to make sure you are getting enough protein, vitamins, and minerals while you are losing weight quickly. Eating mostly protein, fruits, vegetables, and whole grains will help your body get the nutrients it needs.
Protein may be the most important of these foods early after surgery. Your body needs protein to build muscles and other body tissues, and to heal well after surgery. Low-fat protein choices include:
Skinless chicken
Lean beef or pork
Fish
Whole eggs or egg whites
Beans
Dairy products, which includes low-fat or nonfat hard cheeses, cottage cheese, milk, and yogurt.