dsfacts logo

Get the Facts on Duodenal Switch.

Weight Loss

woman hugging scale Weight loss after surgery can be very dramatic. The fastest rate of weight loss will happen during the first 3 months after surgery. After the Duodenal Switch patients can expect to lose 0.5 to 1 lb. per day or 40 to 90 lbs. by 3 months post-op. [51] Rapid weight loss decreases by 6 to 9 months after the procedure and peak weight loss is achieved at 12 to 18 months post-op.

For some, getting rid of weight daily becomes an obsession after surgery. The weight may fluctuate up or down on a daily basis. Moreover, the weight loss may not be constant and regular. Do not be alarmed with the small weight gains or lack of weight loss over a short period of time. The best advice is to get weighed 1-2 times a month at the follow-up with a doctor.

If a patient is a member of any surgery support forums they will probably be comparing their weight loss with others. IT is important not to compare weight loss rates among other patients. There are a wide number of variables that may not be known, all of which are factors specific to a patients weight loss rate. As we said above, in the first 3 months a patient can lose anywhere between 40 to 90 lbs. That is a very big range..


By Carolyn M.

Two people, both 6 months post-op. One has lost only 63 pounds and feels bad about her "slow" weight loss. The other has lost 96 pounds and thinks she's doing great.

They are both wrong.

Person A had only 105 excess pounds, so she has already lost 60% of her excess weight. She is actually ahead of the game at 6 months out and is on track to lose it ALL.

Person B had 265 excess pounds. At 6 months out she has only lost 36% of her excess weight. At this rate, she will end up retaining 28% of her excess weight, enough to keep her in the obese category.

What this means is that the percent excess weight loss is a much more critical number than that absolute number of pounds lost.

Percent of excess weight lost: pounds lost divided by total excess pounds.

Use a BMI of 30 as a goal weight.

Please note: These are averages. A patient’s individual weight loss will be different.

Weight Loss Goals for the Super Morbidly Obese

By Amanda L. - DS

Pediatric Endocrinologist

For some of the super morbidly obese (BMI 50+) the goal of 100% of estimated weight loss cannot be achieved without the plastic-reconstructive surgery.

My plastic surgeon prefers people to be at 90% of estimated loss before extensive lower bodywork. Not only that but she required you to be at a stable weight for 6-9 months.