Adults who regularly consumed foods containing moderate to high levels of live microbes, including yogurt and other fermented foods, showed healthier cholesterol, insulin and body-weight measures, although researchers cautioned that the observational findings do not prove the foods caused those improvements.
By yourNEWS Media Newsroom
Regular consumption of fermented foods containing live microbes was associated with several favorable cardiovascular and metabolic health markers in a new Australian study, adding to growing research examining how diet and the gut microbiome may influence heart health.
Researchers from the University of Newcastle found that healthy adults who consumed greater amounts of foods containing moderate or high concentrations of live microorganisms tended to have higher levels of high-density lipoprotein, or HDL, cholesterol, lower fasting insulin and more favorable measurements of body weight and waist circumference.
The findings were observational, meaning researchers identified associations rather than proving that fermented foods directly caused the differences.
Even so, the results add to emerging evidence suggesting that foods such as yogurt, kefir, kimchi and other fermented products may affect more than digestion by influencing metabolic processes connected to cardiovascular health.
For the study, researchers first developed a database estimating the amount of live microorganisms present in more than 200 commonly consumed foods.
Foods were classified according to estimated colony-forming units, a measure of viable microorganisms.
Most foods included in the database contained relatively low levels of live microbes.
Only 21 were categorized as having moderately high amounts, while yogurt and sour cream were the only common foods consistently classified in the highest live-microbe category.
Researchers then compared the diets of 58 healthy adults with measurements of metabolic health.
Participants who consumed more foods from the medium- and high-microbe groups generally showed a healthier metabolic profile.
Higher intake was associated with increased HDL cholesterol, lower fasting insulin levels, lower body weight, smaller waist circumference and reduced body mass index.
Those associations remained after researchers accounted for factors including sex and overall calorie consumption.
HDL is commonly described as “good” cholesterol because it helps transport excess cholesterol away from tissues and blood vessels and toward the liver for processing and elimination.
By contrast, elevated levels of low-density lipoprotein, or LDL, cholesterol can contribute to cholesterol deposits within artery walls and increase cardiovascular risk.
The researchers suggested that one possible explanation for the findings involves compounds produced during fermentation and by intestinal bacteria after fermented foods are consumed.
Among the compounds drawing particular attention are short-chain fatty acids.
These molecules are produced when certain bacteria ferment dietary material in the digestive tract and can act as biological signaling compounds throughout the body.
Research indicates short-chain fatty acids may help regulate glucose and fat metabolism, influence blood-vessel function and moderate inflammatory responses.
Those effects provide a potential mechanism through which foods carrying live microorganisms could influence cholesterol, insulin sensitivity and other cardiovascular risk factors.
The theory also fits into a broader body of research examining how the intestinal microbiome interacts with diet.
Fermented foods have been consumed for thousands of years, initially because fermentation provided a practical way to preserve milk, vegetables, grains and other foods before modern refrigeration.
Different cultures developed foods ranging from yogurt and kefir to kimchi, sauerkraut and fermented cheeses.
Modern research has increasingly focused on whether the microbes and compounds contained in those foods can affect human health after consumption.
Specific fermented products have previously been associated with certain benefits. Kefir, for example, has been studied for its ability to improve lactose digestion, while kimchi and other fermented vegetables are frequently investigated for their probiotic properties.
The Australian research differs by examining live-microbe exposure across an overall diet rather than focusing exclusively on one fermented food or bacterial strain.
The results also align with other research examining probiotics and cardiovascular markers.
A separate 2024 study reported that probiotic supplementation increased HDL cholesterol among people with type 2 diabetes.
Researchers are also continuing to investigate fermented beverages such as kombucha and their potential effects on metabolism and the gut microbiome.
Taken together, such studies have strengthened scientific interest in the possibility that microorganisms consumed through food can interact with the existing microbial communities in the gastrointestinal tract and influence processes extending well beyond digestion.
However, the University of Newcastle researchers cautioned against interpreting their findings as evidence that fermented foods directly prevent cardiovascular disease or improve cholesterol.
Because the study captured participants’ dietary habits and health measurements at a particular point in time, it cannot determine which came first.
People who regularly consume fermented foods could also differ in other dietary, exercise or lifestyle behaviors that contribute to better metabolic health.
Researchers said controlled intervention trials will be needed to determine whether deliberately increasing live-microbe food intake produces measurable improvements.
Future research could also directly measure changes in participants’ gut bacteria and production of short-chain fatty acids to determine whether those mechanisms account for the observed associations.
The distinction is particularly important because cardiovascular disease remains one of the leading causes of death worldwide, making dietary claims surrounding prevention and treatment consequential.
For people who already enjoy fermented foods, researchers say incorporating foods containing live cultures can be a relatively accessible component of a broader nutritious diet.
Plain yogurt and kefir are among the highest-microbe options, while fermented vegetables can provide another source, although live-organism content varies substantially depending on preparation, processing and storage.
Not every product marketed as fermented necessarily contains living microorganisms by the time it is eaten. Heat treatment and some commercial processing methods can destroy the microbes generated during fermentation.
Fermented foods can also differ considerably in added sugar, sodium, saturated fat and other nutritional characteristics, making the overall composition of a product important when considering its health effects.
“Fermented foods are items processed by bacteria, yeasts or molds to create gradual chemical changes, as seen in examples like yogurt, sauerkraut and cheese,” said BrightU.AI‘s Enoch. “They contain live enzymes that aid in digesting both themselves and other foods. These foods also help balance gut bacteria, retain vitamins well and have a naturally long shelf life.”
The Australian findings therefore offer another indication of a possible connection between dietary microbes, the intestinal ecosystem and cardiovascular metabolism, but they stop short of demonstrating cause and effect.
For now, the evidence suggests that fermented foods may be one useful element of an overall healthy dietary pattern, while larger and more controlled studies are needed to determine exactly how much of the observed metabolic benefit can be attributed to the live microorganisms themselves.
Source: Natural News
Watch this video about the book “Wild Fermentation: The Flavor, Nutrition, and Craft of Live-Culture Foods” by Sandor Ellix Katz.
This video is from the BrightLearn channel on Brighteon.com.
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