Health Day - ONLINE EDITION

Gut Bacteria Shift Quickly After Changes in Diet, Study Shows

Number and type of gut microbes shifted within a day of eating plant- or animal-based foods exclusively

  • Print

WEDNESDAY, Dec. 11, 2013 (HealthDay News) -- If you were to switch from vegetarianism to meat-eating, or vice-versa, chances are the composition of your gut bacteria would also undergo a big change, a new study suggests.

The research, published Dec. 11 in the journal Nature, showed that the number and kinds of bacteria -- and even the way the bacteria behaved -- changed within a day of switching from a normal diet to eating either animal- or plant-based foods exclusively.

"Not only were there changes in the abundance of different bacteria, but there were changes in the kinds of genes that they were expressing and their activity," said study author Lawrence David, an assistant professor at the Institute for Genome Sciences and Policy at Duke University.

Trillions of bacteria live in each person's gut. They're thought to play a role in digestion, immunity and possibly even body weight.

The study suggests that this bacterial community and its genes -- called the microbiome -- are extraordinarily flexible and capable of responding swiftly to whatever is coming its way.

"The gut microbiome is potentially quite sensitive to what we eat," David said. "And it is sensitive on time scales shorter than had previously been thought."

David said, however, that it's hard to tease out exactly what that might mean for human health.

Another expert agreed.

"It's nice to have some solid evidence now that these types of significant changes in diet can impact the gut microflora in a significant way," said Jeffrey Cirillo, a professor of microbial and molecular pathogenesis at the Texas A&M Health Science Center College of Medicine in Bryan, Texas. "That's very nice to see, and it's very rapid. It's surprising how quick the changes can occur."

Cirillo said it was also intriguing how fast the microbiome seemed to recover. The study found that gut bacteria were back to business as usual about a day after people stopped eating the experimental diet.

For the study, researchers recruited six men and four women between the ages of 21 and 33. For the first four days of the study, they ate their usual diets. For the next five days, they switched to eating either all plant-based or all animal-based foods. They then went back to their normal eating habits before switching to the other diet pattern.

The animal-based diet resulted in the biggest changes to gut bacteria. It spurred the growth of 22 species of bacteria, while only three bacterial species became more prominent in the plant-based diet.

The researchers don't fully understand what the shifts mean, but, they said, some made sense. For example, several types of bacteria that became more prevalent with the animal-based diet are good at resisting bile acids. The liver makes bile to help break down fat.

Another type of bacteria, which became more common in the plant-based diet, is thought to be sensitive to fiber intake.

The researchers speculated that the bacterial shifts might explain why fatty diets have been linked to diseases like Crohn's and ulcerative colitis. More studies are needed, however, before they can say for sure.

More information

For more on overweight and obesity, visit the Human Microbiome Project.

Fact Check

Fact Check

Have you found an error, or know of something we’ve missed in one of our stories?
Please use the form below and let us know.

* Required
  • Please post the headline of the story or the title of the video with the error.

  • Please post exactly what was wrong with the story.

  • Please indicate your source for the correct information.

  • Yes

    No

  • This will only be used to contact you if we have a question about your submission, it will not be used to identify you or be published.

  • Cancel

Having problems with the form?

Contact Us Directly
  • Print

You can comment on most stories on winnipegfreepress.com. You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

You can comment on most stories on winnipegfreepress.com. You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

Have Your Say

New to commenting? Check out our Frequently Asked Questions.

Have Your Say

Comments are open to Winnipeg Free Press print or e-edition subscribers only. why?

Have Your Say

Comments are open to Winnipeg Free Press Subscribers only. why?

The Winnipeg Free Press does not necessarily endorse any of the views posted. By submitting your comment, you agree to our Terms and Conditions. These terms were revised effective April 16, 2010.

letters

Make text: Larger | Smaller

LATEST VIDEO

Exciting changes expected for Saturday's Santa Claus parade

View more like this

Photo Store Gallery

  • PHIL.HOSSACK@FREEPRESS.MB.CA 100527-Winnipeg Free Press THe Provencher Foot Bridge is lit up
  • PHIL.HOSSACK@FREEPRESS.MB.CA Winnipeg Free Press 090528 STAND UP...(Weather) One to oversee the pecking order, a pack of pelican's fishes the eddies under the Red River control structure at Lockport Thursday morning......

View More Gallery Photos

Poll

How much does the premier's apology mean to you?

View Results

View Related Story

Ads by Google