A daily serving of yogurt combined with simple lifestyle changes could modestly slow biological aging, according to a new clinical study published in the journal Aging.

Researchers in Japan examined the health effects of a three-month diet and exercise program on 48 overweight men between 50 and 74 years old.

Half of the participants followed a strict wellness plan for 12 weeks, while the other half continued their usual routines.

Those in the intervention group ate 100 grams of plain yogurt each day and received personalized nutritional advice encouraging them to avoid overeating, minimize snacking, and skip sugary drinks.

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They were also instructed to walk or use a stepper machine for about 30 minutes a day, at least three times a week.

Scientists collected blood samples before and after the trial and analyzed participants’ DNA for chemical changes linked to cellular aging.

They used a tool called DunedinPACE, which measures how quickly a person’s body is aging, independent of calendar years.

According to the study, men who ate probiotic yogurt, altered their diets, and exercised experienced a statistically significant slowdown in their biological aging rate compared with the control group.

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On average, their pace of aging decreased by roughly 2.2%, an effect similar to that seen in a U.S. study where calorie intake was reduced by 25% over two years.

Importantly, the slower aging occurred regardless of weight loss, as results did not align directly with changes in body mass index or exercise frequency.

The researchers also noted a measurable improvement in a DNA marker associated with kidney function.

Because the study combined probiotics, dietary adjustments, and physical activity, the authors stated that it was not possible to attribute the effects to any single factor.

They concluded that the observed benefits likely came from the combined influence of all three elements.

However, the researchers acknowledged several limitations, including the small sample size and short duration of the study.

All participants were overweight men from the same country, meaning the findings may not extend to other populations.

The paper emphasized that further research is needed to determine whether these short-term biological shifts can lead to lasting health improvements.