A daily serving of plain yogurt costing just a few dollars may help slow or even reverse biological aging at the cellular level, a recent study found.
Probiotic yogurt is packed with live bacterial cultures that support gut health and may reduce inflammation.
These benefits stem from interactions between probiotics and the gut microbiome — the community of microorganisms that plays a key role in overall health and longevity.
In a comparison between one group that ate slightly less than half a cup of probiotic yogurt, received dietary advice, and exercised, and another that made no diet or lifestyle changes, researchers found that the former’s aging measures shifted by two percent.
While a seemingly small percentage, it is the amount of change researchers typically interpret as a reversal in biological age, not just a pause.
While the yogurt group also lost weight, that alone did not explain the reversal of aging. Instead, improvements in metabolic regulation, reduced inflammation, and better gut function likely played a role, researchers believe.
And previous research has suggested that people with more diverse gut bacteria may have better metabolic health and immune function, both of which contribute to a longer lifespan.
Daily yogurt, combined with exercise and better eating habits, was linked to a slowdown in biological aging in a recent 12-week trial (stock)
The 12-week randomized controlled trial, the results of which were published in the journal Aging, enrolled 48 overweight Japanese men aged 50 to 74.
Participants were split into two groups: an intervention group that received daily dietary and exercise counseling plus 100 grams, or 0.4 cups, of plain yogurt containing the probiotic strain Bifidobacterium longum BB536, and a control group that maintained their usual habits.
Researchers collected blood samples at the start and end of the trial to measure aging biomarkers, including DunedinPACE, an epigenetic tool that tracks how quickly the body ages at the cellular level.
The yogurt and lifestyle group showed a roughly 2.2 percent slowdown in their pace of biological aging over 12 weeks.
And within the intervention group alone, the slowdown relative to their baseline was statistically significant at 2.3 percent, while the control group’s pace remained essentially unchanged.
While that might sound small, it is comparable to the effects observed in longer, more intensive calorie-restriction studies. And, importantly, it was achieved through manageable, realistic adjustments rather than extreme dieting.
The study also found a notable drop in a DNA marker linked to kidney stress called DNAmCystatinC, hinting that the benefits may extend beyond aging to support overall metabolic and renal health.
DNAmCystatinC tends to rise when kidneys are under more strain.
After 12 weeks, the group that did the program showed a clear drop in this marker, while the control group showed no change. The intervention group’s average sat around -2,500, compared to the control group’s 7,500 — a gap of roughly 10,000 units.
While the results are encouraging, the researchers were careful to note this was a small, short-term trial in middle-aged men, and more research is needed to see if these changes stick or translate into longer, healthier lives.
The white dot represents the control group and the black dot is the group that ate yogurt and exercised. After 12 weeks, the yogurt and exercise group showed a significant decrease in DNAmCystatinC, a marker linked to kidney function, compared to the control group
Bifidobacterium longum BB536 may help dial down systemic inflammation, a core hallmark of aging, through its effects on the gut, according to previous research.
The yogurt’s probiotic strain produces beneficial byproducts, including a compound called indole-3-lactic acid (ILA). ILA, in turn, may help reduce oxidative stress and inflammation, which are known drivers of cellular aging.
The researchers suspect the renal benefit of a drop in DNAmCystatinC could be linked to the probiotic’s influence on gut-derived toxins such as indoxyl sulfate, which are hard on the kidneys.
Probiotic yogurt is often held up as the gold standard for gut health, and for good reason. It is one of the most studied fermented foods.
Unlike supplements, yogurt delivers beneficial bacteria in a food manner that can improve their survival through the digestive tract.
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Specific strains, like the Bifidobacterium longum BB536 used in the study, have been linked to reduced inflammation, improved digestive function and enhanced immune response.
Some research has also tied regular yogurt consumption to better metabolic health, including lower blood pressure and a reduced risk of type 2 diabetes.
It is believed that these strains produce bioactive compounds, such as short-chain fatty acids and anti-inflammatory metabolites, that can influence not just the gut, but the broader body, including the immune and even nervous systems.
Another benefit of yogurt is its versatility. It can be eaten on its own or dressed up with a variety of healthy toppings, such as fresh berries, low-fat granola, or a drizzle of honey.
It also works well in smoothies, as a substitute for sour cream, or as a base for creamy dressings and dips.
This makes it an easy food to incorporate into daily meals and snacks, which may help people stick with it as a regular habit.
But the science behind yogurt’s benefits is not as solid as some marketing may suggest. Not all yogurts are created equal.
Different strains have different effects and many commercial yogurts do not contain enough live bacteria to make a meaningful difference or they contain strains that have not been rigorously tested in humans.
Much of the research on yogurt and health is observational, meaning it can show a link between yogurt consumption and better health outcomes, but it cannot prove cause and effect.
People who eat yogurt regularly often have other healthy habits, such as exercising more or eating a better overall diet, which makes it difficult to isolate yogurt’s specific contribution.
And while the latest short-term trial showed a measurable shift in epigenetic aging, the researchers themselves cautioned that these findings are exploratory and need to be replicated in larger, longer studies.
