Bariatric Surgery Pre-Operative Diet and Medication

Pre-Operative Diet

At BodyFree Weight Loss Clinic, all patients are required to commence an Optifast based diet for a period of 2-3 weeks prior to Obesity Surgery. This diet induces a change to the patient’s metabolism putting it into a Ketotic state, known as Ketosis. During this period the patient’s diet will be restricted, with only certain additional foods allowed (your Dietitian will provide clear direction tailored to you). There are no carbohydrates, sugars, fruits or juices etc. permitted during this Optifast period.

The ketosis will result in fat stores coming out of the liver to provide the metabolic fuel your body needs. During surgery, it is necessary to retract the liver – the reduction in fat stores in the lead up to surgery allows for this to be done safely without risk of damaging or tearing the liver during the procedure.

Some patients may note that they can lose 5-10% of their body weight during this period. (It would be terrific if this were sustainable long term, but Optifast isn’t sustainable over time).


Most medications can continue until the day of surgery, and they will be recommenced post-operatively under our direction. There are several blood thinners and anti-platelet agents which will need to be stopped 2-10 days prior to surgery depending on the particular medication. We will provide advice tailored to each patient. Fish Oil supplements should not be consumed within 14 days of surgery.

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