Will Bowel Movements Change After Gastric Bypass?

by Channing A.
(Matthews, NC)

Does food move through rapidly and cause loose stools or diarrhea after RNY Gastric Bypass surgery?

I had an RNY Gastric Bypass done in July of last year… is it normal to have loose stools or diarrhea with accidents in the pants from food that is moving through too rapidly.

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Bowel Movements Change After Gastric Bypass

by: Jeff

Hi Channing,

Yes, the more of the stomach that has been removed or bypassed, the more likely you would be to experience diarrhea and loose stools. These are a couple of the symptoms that can occur under the umbrella of "dumping syndrome" which occurs to some degree in about 80% of gastric bypass patients.

It can also occur in other procedures that bypass or remove part of the stomach including gastric sleeve and duodenal switch surgery.

The good news is that most patients are able to avoid dumping symptoms as long as certain dietary guidelines are followed. In fact, many patients say that they actually LIKE dumping syndrome as the risk of it occurring provides a strong incentive to keep their diets on course and their health and weight improvement continuing.

General dietary guidelines to avoid dumping include:

1. Eat several small meals each day rather than 3 larger meals

2. Remove sugar, refined carbs and most fats from your diet

3. Don't drink anything with your meals (the liquid can speed up digestion)

4. Stay on top of the bariatric vitamin regimen prescribed by your dietitian.

5. Lie down after eating to slow down digestion.

See this Dumping Syndrome page for all of the details.

Hope that helps,


Related Page:
- Gastric Bypass Side Effects

DISCLAIMER: The above is provided for informational purposes only and should not be taken as medical advice. It should support, not replace, the relationship between the patient and his/her physician(s).

Eliminate the Sugar

by: NurseLife

You cannot eat anything with refined sugar or you will experience this "dumping syndrome."
I'm 17 years post op and I still have these experiences if I eat refined, high carb foods.

Bowel Movement

by: Kimberly Kirkland

Thanks for sharing!


by: Amanda

I have experienced a couple of accidents, too. I am out 1.5 years. However, within my first 5 months post surgery, I had 3 accidents.

They finally stopped. Then, I went for a year with no dumping symptoms. My weight loss also stalled.

About 4 months ago, after a 72lb weight loss/stall, my body woke up again. I am currently 147lbs (another 11 lbs down), but now, I have an orange/ oily discharge, which I have read is fat that your body doesn't absorb. Also, the gas is back.

I have to go back and start paying better attention to what I am eating, since I believe that I am eating too much fat if it's exiting my tush. I am not sure why, but I can assume that we all react differently to our surgeries.

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