How does gastric bypass help you achieve weight loss?
Gastric bypass severely restricts the quantity of food you can eat at any one time. By eating only at meal times and only until you feel full, your daily food intake will be decreased resulting in a weight loss of between one and three kilograms per week during the first six months after surgery. Thereafter, the weight loss slows but continues for up to 12 to 15 months.
How much weight can you expect to lose?
While it is usually possible for at least two-thirds of excess weight to be lost over a 12 to 18 month period - it is not possible to predict accurately how much weight an individual patient will lose.
For example, a 120 kg person with an ideal body weight of 60 kg could expect to lose 40 kg and thus achieve a stable weight of 80 kg. Except in a few instances (see below) the weight loss after silastic ring gastric bypass is permanent and is accompanied by prospects of better health in the years to come and usually an improved quality of life.
This graph shows the weight reduction of a typical patient over a two year period. This patient's weight before operation was 156 kg and there was a reduction over the two year period to 93 kg.
You will notice that the rate of weight loss is greatest soon after the operation and then slowly stabilises so that after 15 to 18 months there will probably not be any further significant weight loss.
The amount of weight that is lost can be influenced significantly by how carefully you follow the recommendations regarding eating habits after the surgery and also how much regular exercise you take following the surgery.
Will the weight loss be permanent?
Weight loss always occurs after Fobi Pouch gastric bypass and the results are generally better than after other forms of gastric surgeries.
With all gastric bypass surgeries, there is a possibility to regain some weight over the years, but this is usually not a major problem. The main reason for failure of permanent weight loss after most forms of gastric bypass relates to the possibility of staple line breakdown, which can occur in up to 10% of patients over a period of time. When staple line disruption occurs not only may weight gain follow but stomach ulceration may develop resulting in pain and the need for further tests and ongoing treatment. If this happens a further operation can be undertaken to rectify the problem, but this is more risky than the first operation.
At the Wakefield Obesity Clinic we routinely perform the transected silastic ring gastric bypass (Fobi Pouch) which overcomes the possibility of staple line breakdown, by dividing the stomach at the time of surgery. Thus, permanent weight loss is achieved in almost all instances. This is one of the major benefits to the Fobi Pouch technique. The precise amount of permanent weight loss will vary, but is generally greater than half of the excess weight.
Can the operation be reversed?
Serious problems after Fobi Pouch are very unusual and we have never had to reverse one of these operations. However, if the need arose, it is possible to perform a reversal by further surgery.
In around 2-3% of our patients, eating is so restricted after Fobi Pouch surgery that we suggest removal of the silastic ring. This can usually be accomplished laparoscopically. Some weight regain may occur, but not in all individuals. This operation is not a reversal. When this is necessary it is performed under our fixed price agreement and is therefore done at no further cost to the patient.
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