University of Utah researchers found that mice given the gut bacterium Turicibacter gained substantially less weight and had lower levels of ceramides while eating a high-fat diet, raising questions about whether fiber-rich foods that support the microbe could eventually play a role in metabolic health, though the findings have not yet been established in humans.
By yourNEWS Media Newsroom.
A bacterium naturally found in the digestive tract sharply reduced weight gain in mice eating a high-fat diet, according to University of Utah research that adds to growing scientific interest in the relationship between the gut microbiome, nutrition and metabolic health.
The study, published in Cell Metabolism, focused on Turicibacter, a bacterial genus found in the intestinal microbiome. Researchers discovered that supplementing mice with the bacterium produced substantial differences in weight gain even though the animals continued consuming a high-fat diet.
Over the eight-week experiment, mice in the control group gained approximately 25% of their body weight.
Mice receiving Turicibacter, by comparison, gained about 10%.
The size of that difference surprised researchers and suggested that changes within the intestinal microbial community could influence how the body responds metabolically to food.
The findings do not demonstrate that taking Turicibacter or eating foods associated with the bacterium will produce comparable weight-loss effects in people. The experiment was conducted in mice, and researchers emphasized that controlled human studies will be necessary before the results can be translated into dietary or medical recommendations.
Still, the research may help scientists better understand why weight regulation cannot always be explained by calorie intake alone.
Approximately 74% of American adults are classified as overweight or obese, according to the Centers for Disease Control and Prevention. Excess body weight is associated with increased risks of conditions including type 2 diabetes, cardiovascular disease and some cancers.
Traditional weight-management advice has generally emphasized achieving an energy deficit by consuming fewer calories than the body expends.
The new research does not overturn that basic principle of energy balance, but it suggests that the gut microbiome may be another biological factor influencing metabolism and the body’s response to different diets.
The team, led by University of Utah immunologist Dr. June Round, found effects extending beyond differences in body weight.
Mice supplemented with Turicibacter also had reduced levels of certain ceramides in their intestines.
Ceramides are fatty molecules involved in numerous normal biological processes, but elevated levels of some ceramides have been associated with metabolic dysfunction, including insulin resistance, a major feature of type 2 diabetes.
The lower ceramide levels observed in the mice suggested that Turicibacter may influence metabolic pathways in addition to affecting weight gain.
Researchers are now working to determine precisely how the bacterium produces those effects.
One potential explanation involves diet.
Turicibacter appears to benefit from dietary fiber and certain plant compounds, potentially using them as substrates and producing metabolic byproducts that can influence the host.
That relationship could also explain why diets high in fat and low in fiber may work against the bacterium.
If the intestinal environment does not contain the nutrients Turicibacter requires, populations of the microbe may decline. Researchers therefore see a possible cycle in which a low-fiber diet not only affects the person consuming it but also changes the microbial ecosystem living in the digestive tract.
The findings have generated interest in foods that may encourage Turicibacter and other beneficial gut organisms without requiring a bacterial supplement.
Beans and lentils are among the foods emphasized because of their fiber content.
Other foods identified as potentially supportive include onions, garlic, artichokes and asparagus.
Cacao contains plant compounds and fiber that may also contribute to a microbial environment favorable to beneficial bacteria.
Plum juice has attracted particular attention because its polyphenols appear to be associated with increased Turicibacter levels.
Foods containing omega-9 fatty acids, including olive oil, avocados and nuts, have also been described as supportive of the bacterium.
Those associations should not be interpreted as evidence that eating any individual food will reproduce the dramatic weight differences seen in the mouse experiment.
Rather, the findings provide another possible biological explanation for the benefits frequently associated with diets emphasizing diverse whole plant foods.
Fiber reaches portions of the digestive system where gut bacteria can ferment it, producing compounds that can interact with metabolic and immune processes.
Scientists have only relatively recently begun to appreciate the scale of that relationship.
The human gut contains trillions of microorganisms, including bacteria, viruses and fungi. Together, these organisms make up the gut microbiome, an ecosystem increasingly being investigated for its roles in digestion, immune function, metabolism and other aspects of health.
Research over recent decades has moved the microbiome from a relatively specialized field into a major area of biomedical investigation.
The Utah findings fit within that larger effort to understand whether particular microbes — or substances produced by those microbes — can be harnessed to improve health.
An important question is whether scientists need to administer Turicibacter itself or whether dietary changes could encourage populations already living in the gut.
No commercial Turicibacter supplement is currently available based on the research described, making the food-microbe relationship the more immediately relevant part of the findings for consumers.
The study also raises questions about the effectiveness of approaching weight management entirely through restriction.
Severe reductions in calorie intake can produce biological adaptations, including changes in hunger signals and energy expenditure, that can make long-term weight management difficult.
The Turicibacter findings point toward another avenue of investigation: whether nourishing particular microbial communities can favorably influence metabolism while people focus on the quality and composition of their diets.
That possibility remains a research question rather than an established weight-loss strategy.
Round stressed that the improved weight outcome was demonstrated in mice and that researchers do not yet know whether humans would respond in the same way.
That distinction is especially important because many treatments that appear effective in animal models ultimately produce weaker, different or no effects in human trials.
Researchers must first identify the specific biological mechanism responsible for the observed changes.
One goal is to determine which compound or compounds generated or influenced by Turicibacter are responsible for the reduction in weight gain and ceramide levels.
Scientists would then need controlled human studies to evaluate whether the same pathway exists in people, whether manipulating it is safe and whether any measurable metabolic benefit results.
The research therefore offers a potential direction for future obesity and metabolic-health studies rather than a ready-made treatment.
It also provides additional support for studying diets rich in fiber and diverse plant foods, which provide nutrients used by a range of intestinal microbes.
“A healthy gut microbiome is a diverse and balanced community of trillions of microorganisms living in your digestive tract,” BrightU.AI’s Enoch said. “It aids in digestion, supports the immune system and helps produce essential nutrients. This balance is crucial for overall physical and mental wellness.”
The mouse findings do not establish that Turicibacter is a cure for obesity or that people can prevent weight gain simply by consuming beans, lentils, plum juice or other foods associated with the bacterium.
They instead identify a potentially significant interaction between one intestinal microbe and metabolic processes that scientists can now investigate more closely.
If future human research confirms a similar effect, the work could eventually help researchers develop dietary strategies, microbial therapies or compounds based on the biological pathways influenced by Turicibacter.
For now, its strongest practical connection is to an already familiar nutritional principle: diets containing a variety of fiber-rich plant foods can help support a diverse intestinal microbial ecosystem.
The University of Utah study provides a new reason to examine why that ecosystem matters, suggesting that some of the organisms nourished by everyday foods may play a greater role in weight and metabolic regulation than scientists previously understood.
Source: Natural News
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