-  BMI is 35 or less: Not necessary unless the patient is cautious to do it a few days before surgery
-  BMI is 35 to 42 liquid diet for one week
-  BMI is 42 to 45 liquid diet for two weeks
-  BMI is 45 or more: For instance, patients weighing 300 lbs will need three weeks, 400 lbs diet for 4 weeks and so on.

•  Increase your protein consumption
•  Eat lean meats
•  Lower your carbohydrate consumption
•  Avoid breads, pasta, cereals, rice, etc.
•  Eliminate Sugars
•  Eliminate candy, desserts, juices, sodas

The list below is a typical diet two weeks before gastric sleeve surgery.

•  Breakfast
•  Protein Shake – get a high quality protein shake from GNC or other supplement store in your area.
•  Make sure there is no sugar in the protein shake.
•  Lunch
•  Vegetables and Lean Meat
•  Dinner
•  Vegetables and Lean Meat
•  Snacks
•  You can have a healthy, low carbohydrate snack in-between meals.
•  Nuts, berries, vegetables, small salad with oil and vinegar, etc.
•  Fluids
•  Stay hydrated. This will help curb your hunger.
•  You can typically drink anything sugar free and low in calories.