The study involved 75 healthy older adults aged 55 to 70 in a randomized controlled trial.
The probiotic Pediococcus acidilactici PA53 improved happiness scores by 12.7% and sleep quality by 23% after eight weeks.
Digestive symptom scores dropped 9.5% and stool consistency improved by 28% on the Bristol Stool Scale.
Blood tests showed significant decreases in inflammation markers IL-6 and TNF-?, plus growth of beneficial gut bacteria.
Researchers called the findings promising but preliminary, noting larger and longer studies are needed to confirm results.
A recent clinical trial suggests that a single, lesser-known probiotic strain, Pediococcus acidilactici PA53, may offer a surprising boost to mood, sleep quality, and digestion in adults aged 55 to 70. Researchers in China found that participants taking this specific bacterium daily for eight weeks reported brighter moods, better sleep, and fewer digestive complaints. The findings, published in The Journal of Nutrition, point to the “gut-brain axis” as a promising, natural lever for emotional wellness in later life.
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