Q & A Library

Print this page | Sign up for free e-bulletins

Belly Too Big?

After I eat, my stomach swells to the point that I appear nine months pregnant. It happens after every meal, regardless of what I eat. It is not only uncomfortable, but unsightly, and I have to unbutton my clothes. What can I do? Is this something to be concerned about?

Answer (Published 1/11/2010)

The bloating you experience after eating could mean a number of things ranging from gas to lactose intolerance or even overeating, so I consulted an expert, Gerard Mullin, M.D., an integrative gastroenterologist at Johns Hopkins Medical Center in Baltimore. He told me that bloating and distension after eating can result from unbalanced overgrowth of bacteria in the small bowel. Dr. Mullin also said that bacterial fermentation of food produces gas that can increase waist size several inches after a meal.

Related Weil Products
The Weil Vitamin Advisor for Digestive Issues - Digestive problems can be uncomfortable and impact your quality of life. Simple changes to your diet, lifestyle and supplement routines may help. Start your free evaluation now!

This condition, known as SIBO (small intestinal bacterial overgrowth), occurs when there are a lot more bacteria than normal in the small intestine, especially when the excess bacteria are more like those that are normally found in the colon (aka the large intestine). The colon contains more than one billion bacteria per milliliter of fluid, compared to fewer than 10,000 bacteria per milliliter of fluid in the small intestine. Symptoms of SIBO include the bloating and distension you describe, plus flatulence, diarrhea, and abdominal pain.

Fortunately, this condition can be easily diagnosed with a test called the lactulose hydrogen breath test. Before testing, you have to fast for 12 hours. At the start, you blow up a balloon with a single breath of air. Then you eat a small amount of lactulose or glucose (sugars) and blow periodically into a balloon every 15 minutes for three hours or more. Although there are some limitations to this test, in all likelihood it can tell you whether your symptoms are due to SIBO. If so, the treatment is antibiotics in conjunction with specific probiotics for a week or two.

Dr. Mullin suggests consulting a physician who is aware of the connection between your symptoms and SIBO.

Andrew Weil, M.D.

Creative Commons License Some Rights Reserved Creative Commons Copyright Notice
A portion of the original material created by Weil Lifestyle on DrWeil.com (specifically, all question and answer-type articles in the Dr. Weil Q&A Library) is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.