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Lifestyle Program With Daily Probiotic Yogurt Linked to About 2% Shift in Biological Aging Pace
In A Nutshell
- A 12-week program combining daily probiotic yogurt, regular walking, and basic nutrition coaching was linked to a roughly 2% shift in a molecular marker of biological aging in overweight middle-aged men.
- Researchers used DunedinPACE, a DNA-based tool that estimates how fast the body is currently aging, not just how old it is.
- Neither weight loss nor exercise frequency alone explained the shift, suggesting the combined lifestyle package mattered more than any single component.
- The trial was small, funded by the yogurt maker, and explicitly exploratory: results are preliminary and need confirmation in larger, independent studies.
Most people assume slowing biological aging requires something drastic: years of strict dieting, grueling exercise, or an expensive supplement stack. A small new trial published in the journal Aging suggests the bar might be lower than that. Overweight middle-aged men who spent 12 weeks eating a daily cup of probiotic yogurt, going for regular walks, and getting basic nutrition coaching showed a modest but measurable shift in a molecular marker tied to how fast the body is aging. The researchers call the result preliminary, not proof.
Over those 12 weeks, men who followed the program showed about a 2.2% slowing in a DNA-based marker called DunedinPACE within the intervention group, and about a 2.3% slower pace relative to controls. Men who made no lifestyle changes showed virtually no shift. The researchers note this range is similar to changes seen in some longer, more demanding studies, including a two-year calorie restriction trial and the DO-HEALTH trial, a three-year study combining vitamin D, omega-3 fatty acids, and a home exercise program, though those used different designs and clocks, and the clinical relevance of such comparisons remains unproven.
Many researchers have assumed it takes years of sustained effort to move the needle on biological aging markers. This trial suggests such markers may respond within a shorter window, at least when targeting multiple aging-related pathways at once. Longer-term studies will be needed to know whether that holds.
What Biological Age Actually Measures
To understand why this result matters, it helps to know what scientists mean by biological aging versus chronological aging. Chronological age is simply how many years a person has been alive. Biological aging is about how fast the body’s cells and organs are wearing down, and two people of the same age can differ dramatically.
Researchers estimate biological aging by reading chemical marks on DNA, a field called epigenetics. DunedinPACE is one such tool, designed to measure how fast aging is happening right now rather than just estimating someone’s age. A score of 1.0 means a person is accumulating biological wear at roughly the same rate as their chronological years. Higher scores suggest faster aging, and prior research has linked DunedinPACE to risks of cardiovascular disease and early death.
Both groups entered the trial with scores above 1.0, meaning they were aging somewhat faster than their calendar years. By the end, the intervention group had dropped from 1.05 to 1.03, while the control group remained essentially unchanged at 1.10. That between-group gap was nominally statistically significant, though the trial was exploratory and not designed to deliver a definitive answer.
Overweight Men in Their 50s and 60s Saw the Shift After Modest Lifestyle Changes
The trial enrolled 48 overweight Japanese men between the ages of 50 and 74, recruited at a cardiology clinic in Tokyo. All participants had a body mass index of 25 or higher, and none regularly ate fermented dairy products going into the study. They were randomly assigned to either the intervention group or a control group told to maintain their usual habits.
Men in the intervention group ate one 100-gram serving of a specific probiotic yogurt every day after breakfast. The yogurt contained 2 billion live units of the Bifidobacterium longum BB536 probiotic strain per serving. They also received dietary counseling focused on reducing overall food intake and cutting back on snacks and sugary drinks, without strict calorie counting. Participants were coached to do walking or stepping workouts at least three days per week for 30 minutes a day, and a stepper device was provided for home use. Adherence to the daily yogurt was high, with intake reported on at least 99% of days.
By the end of the study, the intervention group had lost a meaningful amount of body weight while the control group held essentially steady. The DunedinPACE shift did not appear to be directly explained by weight loss alone. Neither how much weight participants lost nor how often they exercised was significantly associated with changes in DunedinPACE, pointing to the overall package rather than any one thing.
A Kidney Stress Marker Also Improved
Beyond the main aging clock result, researchers also looked at DNA-based protein markers that feed into a separate aging tool called GrimAge. One caught their attention: a proxy for a protein called cystatin C, which the kidneys filter from the blood. When cystatin C runs high, it tends to signal the kidneys are under more stress. In the intervention group, the DNA-based version of that marker dropped meaningfully and held up even after additional statistical tests to guard against false positives.
A second kidney-related marker moved in the same direction, though not strongly enough to clear the bar on its own. The pattern may point to reduced stress on the kidneys, possibly because gut bacteria shifted by the probiotic were producing fewer inflammatory byproducts. One theory the paper explores is that certain gut bacteria, including species related to the BB536 strain, can intercept a compound that normally stresses the kidneys and convert it into something more benign. The researchers are clear this remains a hypothesis the study was not designed to confirm.
For overweight men in their 50s and 60s, what can realistically shift biological aging markers remains an open question. But this small trial offers an early signal: a modest daily habit, some movement, and basic eating guidance may be associated with a short-term shift in how fast the body appears to be aging at a molecular level. Whether that proves durable will require larger, independent studies to find out.
Disclaimer: This article is based on a peer-reviewed study, but the findings are preliminary and should not be taken as medical advice. The trial was small, limited to overweight Japanese men aged 50 to 74, and funded by the manufacturer of the yogurt used in the research. Consult a qualified healthcare provider before making changes to your diet, exercise routine, or supplement regimen.
Paper Notes
Limitations
The trial was small, enrolling 48 participants with 45 completing the per-protocol analysis. The study population was restricted to overweight Japanese men aged 50 to 74, limiting how broadly the findings can be applied to women, younger adults, or people from other ethnic backgrounds. The 12-week duration prevents any conclusions about whether the observed changes in biological aging markers are durable over the long term. Because the intervention combined exercise coaching, dietary guidance, and probiotic yogurt consumption, no single component can be identified as responsible for the results. The open-label design meant participants knew their group assignment, potentially influencing behavior in ways not captured by the study measurements. Dietary intake was not assessed using validated instruments, and exercise intensity and total volume were not formally quantified, which limits the ability to analyze which specific behaviors drove the epigenetic changes. The trial was explicitly exploratory in nature and was not pre-registered with a single primary endpoint, meaning results should be regarded as hypothesis-generating rather than definitive.
Funding and Disclosures
This study was funded by Morinaga Milk Industry Co., Ltd. All five authors are employed by Morinaga Milk Industry Co., Ltd., the company that funded the study and provided the test yogurt used in the trial. The authors declared no other competing interests.
Publication Details
Authors: Tatsuki Nishimura, Ayako Horigome, Miyuki Tanaka, Yukihiro Hishida, and Toshitaka Odamaki, all affiliated with the R&D Division of Morinaga Milk Industry Co., Ltd., Zama, Japan. | Journal: Aging (Aging-US), Volume 18, 2026. | Paper Title: “Short-term responsiveness of DNA methylation-based aging biomarkers to a multimodal intervention comprising exercise and dietary guidance involving daily consumption of yogurt containing Bifidobacterium longum BB536: an exploratory randomized controlled trial” | Published: May 29, 2026 | DOI: https://doi.org/10.18632/aging.206386 | Trial Registration: University Hospital Medical Information Network Clinical Trials Registry, UMIN000057293.
