Pre-Op Diet

Pre-Op Diet

Pre-Op Gastric Surgery:

These are guidelines and recommendations directly from the website.  


2 Weeks Before Surgery:
The diet recommended before your procedure is a low sugar, reduced calorie diet.  It is imperative that the diet observed for the 2 weeks before having any weight loss surgery is a liquid diet to assist in shrinking the liver before having the procedure that you've enlisted to have.

The purpose of the shrunken liver is to allow the Surgeon better access to the exposed stomach laparoscopically while performing your procedure.  This essentially means the Doctor will have an increased area around the liver to execute the procedure they are performing.  The Surgeon will need to lift your liver to access your stomach.  

If your liver is fatty and dense and will not move, it will make it difficult or impossible for them to gain access to your stomach and perform your procedure.  This diet will help you lose weight prior to surgery, but the most important take away would be reducing the size of your liver, making your procedure more comfortable to perform and safer for you.


Special note for patients with Diabetes:
"If you have Diabetes and are treated with insulin or a sulphonylurea tablet  (gliclazide, glibenclamide, tolbutamide, glimepiride, glipizide), you will need to adjust your insulin or medication.  They will need to understand your calories will be around 800/day from the time you start this diet, and medication management goal is to have less medication and not more food."


If you are a patient who is being treated for Diabetes, please contact your Diabetes Specialist, or Nurse Practitioner before starting the diet so that your medications can be safely adjusted and managed.  You also need to be that much more attentive in monitoring your blood sugar to make sure everything is ok.  Consult your medical provider with any and all concerns while moving through this diet.


Special Note for Lactose Intolerant Patients 
"If dairy products, including milk, give you gas, cramping, bloating, or diarrhea, you may be lactose intolerant. It is recommended you choose "Boost Diabetic" for your meal replacement choice because it is lactose-free. If you decide to use a protein shake made with milk products take a "Lactaid" or similar lactase enzyme pill at the start of each meal containing one of these products. 

Due to some of the diet snack choices listed, some of them will not be ok for someone with lactose intolerance to intake.  Some of these choices include cottage cheese and yogurt.  If you choose to eat anything with lactose, it is recommended you take the lactose enzyme."


-No chewing gum with sugar or carb sweetener, breath mints, cough syrup, hard candy, or cough drops, they contain high amounts of sugar.
-Stop usage of tobacco products during this pre-op diet and during your post-op care
-Avoid taking Aspirin, Anticoagulants, Heparin or Warfarin 1 week before your procedure


In regards to food consumption during the liver shrinking diet you can eat as much and drink as much as you want from the following list, but it is recommended to consume reasonable amounts at a max of 40-50 carbohydrates daily.

➤ All the water you can drink
➤ All the natural fruit juice you can drink (make sure it has No Sugar Added on the label) ➤ Coffee or Tea (decaf only)
➤ Low fat creamer, Skim or 1% milk, Soy milk
➤ Sugar-free drinks only (Crystal Light, G-2 Gatorade, Diet Powerade, Propel, etc.)
➤ All the broth you can drink (chicken or vegetable is ok)
➤ Please drink 3 Protein shakes per day. Any flavor is fine (with low sugar and carbs) Diet V-8 fusion, etc.
➤ Sugar-free Gelatin, Popsicles (no fruit added)
➤ Sugar-free Pudding, apple sauce
➤ Low fat cottage cheese
➤ All the plain yogurt you can eat ( Greek yogurt has almost double the amount of protein per serving) 


The average protein intake should be between 70-120 grams a day, through protein shakes, and it is recommended that you take a multivitamin during pre-op and post-op.  

*Tip from our patients: Many recommend Premier Protein and Injury shakes, in regards to better taste. 

Pompeii Surgical is aware that this is a challenging diet to follow and is quite similar to a liquid diet.  If you get hungry, it is acceptable in that first week of the pre-op diet to eat 4 ounces of fish, lean turkey, chicken breast, ham, or roast beef.  It MUST be baked, broiled, or grilled.


The day before your surgery, it is recommended that you drink all clear liquids: water, clear broth, clear juice, cool-aid sugar-free, pulp-free drinks, lemonade, grape juice, apple juice, etc.

The night before your surgery DO NOT EAT OR DRINK anything after Midnight, and you must be on a 100% fast day of surgery.

Any questions or concerns don't hesitate to contact the Patient Coordinator at: