Altering your gut bacteria may help you live longer

Researchers have promoted health and increased lifespan in Drosophila by altering the symbiotic, or commensal, relationship between bacteria and the absorptive cells lining the intestine.

The research by scientists at the Buck Institute for Research on Aging provides a model for studying many of the dysfunctions that are characteristic of the aging gut and gives credence to the growing supposition that having the right balance of gut bacteria may be key to enjoying a long healthy life.

Even though recent research in humans has linked the composition of gut flora with diet and health in the elderly and the list of age-related diseases associated with changes in gut bacteria include cancer, diabetes, and inflammatory bowel disease, lead author and Buck faculty Heinrich Jasper, PhD, said there is no systematic understanding of how we go from having a young, healthy gut to one that is old and decrepit.

"Our study explores age-related changes in the gut that include increased oxidative stress, inflammation, impaired efficiency of the immune response, and the over-proliferation of stem cells," Jasper said. "It puts these changes into a hierarchical, causal relationship and highlights the points where we can intervene to rescue the negative results of microbial imbalance."

Jasper said the bacterial load in fly intestines increases dramatically with age, resulting in an inflammatory condition.

The immune imbalance allows bacterial numbers to expand, triggering an inflammatory response that includes the production of free radicals. Free radicals, in turn, cause over-proliferation of stem cells in the gut, resulting in epithelial dysplasia, a pre-cancerous state.

The study was published in the journal Cell.