Could gut bacteria neutralize our American diets?

A specific strain of human gut bacteria breaks down the chemical fructoselysine and turns it into harmless byproducts, according to new research in mice.

The study sheds light on how human gut microbes break down processed foods—especially potentially harmful chemical changes that modern food manufacturing processes often produce.

Eating processed foods such as breads, cereals, and sodas is associated with negative health effects, including insulin resistance and obesity.

Fructoselysine is in a class of chemicals called Maillard Reaction Products, which form during food processing. Some of these chemicals have been linked to harmful health effects. These findings raise the prospect that it may be possible to use knowledge of the gut microbiome to help develop healthier, more nutritious processed foods.

Gut bacteria and our modern diets

Researchers conducted the study in mice that they raised under sterile conditions, gave known collections of human gut microbes, and fed diets containing processed food ingredients.

“This study gives us a deeper view of how components of our modern diets are metabolized by gut microbes, including the breakdown of components that may be unhealthy for us,” says Jeffrey I. Gordon, professor and director of the Edison Family Center for Genome Sciences & Systems Biology at Washington University School of Medicine in St. Louis.

“We now have a way to identify these human gut microbes and how they metabolize harmful food chemicals into innocuous byproducts.”

Human gut microbial communities see foods as collections of chemicals. Some of these chemical compounds have beneficial effects on the communities of microbes living in the gut as well as on human health. For example, Gordon’s past work has shown that the gut microbiome plays a vital role in a baby’s early development, with healthy gut microbes contributing to healthy growth, immune function, and bone and brain development.

Modern food processing can generate chemicals that may be detrimental to health. Such chemicals have been associated with inflammation linked to diabetes and heart disease. The researchers are interested in understanding the complex interactions between human gut microbes and the chemicals that people commonly consume as part of a typical American diet.

In the study, the researchers showed that a specific bacterium called Collinsella intestinalis breaks down the chemical fructoselysine into components that are harmless.

“Fructoselysine is common in processed food, including ultra-pasteurized milk, pasta, chocolate, and cereals,” says first author Ashley R. Wolf, a postdoctoral researcher in Gordon’s lab. “High amounts of fructoselysine and similar chemicals in the blood have been linked to diseases of aging, such as diabetes and atherosclerosis.”

A unique strain

When researchers fed them a diet containing high amounts of fructoselysine, mice harboring Collinsella intestinalis in their gut microbial communities showed an increase in the abundance of this bacteria as well as an increase in the gut microbial communities’ ability to break down fructoselysine into harmless byproducts.

“This specific bacterial strain thrives in these circumstances,” Gordon says. “And as it increases in abundance, fructoselysine is metabolized more efficiently.”

He adds, “The new tools and knowledge gained from this initial study could be used to develop healthier, more nutritious foods as well as design potential strategies to identify and harness certain types of gut bacteria shown to process potentially harmful chemicals into innocuous ones. A corollary is that they may help us distinguish between consumers whose gut microbial communities are either vulnerable or resistant to the effects of certain products introduced during food processing.”

Emphasizing the complexity of this task, Gordon, Wolf, and their colleagues also showed that close cousins of Collinsella intestinalis did not respond to fructoselysine in the same way. These bacterial cousins, whose genomes vary somewhat, do not thrive in a fructoselysine-rich environment.

The researchers say future studies are necessary before scientists will be able to identify and harness the specific capacities of individual microbes to clean up the array of potentially deleterious chemicals produced during some types of modern food manufacturing.

The study appears in the journal Cell Host & Microbe. Support for the work came from the National Institutes of Health, the American Diabetes Association, the Damon Runyon Cancer Research Foundation, and the Russian Science Foundation.

Gordon is a cofounder of Matatu Inc., a company characterizing the role of diet-by-microbiota interactions in animal health.

Source: Washington University in St. Louis