Also known as: probiotics from food, fermented diet, kimchi sauerkraut yogurt
Latest evidence update: 2025-10-10
Strongest in Consistency (95). Held back by Replication (59).
Solid mix of RCTs with some methodological gaps.
Good cross-study replication, some imprecision.
Tens of thousands of participants pooled across studies.
Studies agree on direction of effect.
Most studies are recent (last 2-3 years).
No per-outcome numbers yet for this one. Each finding's direction and strength is shown in the research below.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
Regular consumption of fermented foods increases microbial diversity and reduces inflammatory markers. The Stanford trial showed 10 weeks of high fermented food intake decreased 19 inflammatory markers.
In subgroup analysis, fermented dairy products decreased CRP specifically in participants with metabolic diseases.
Fermented food consumption improves stool consistency as measured by Bristol Stool Form Scale in healthy adults.
Vitamin D-fortified probiotic yogurt showed consistent benefits for glycemic control and lipid profiles in adults with MASLD.
No significant association was found between yogurt consumption and diabetic retinopathy risk.
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A 12-week multimodal intervention combining exercise and daily yogurt containing Bifidobacterium longum BB536 significantly decelerated DunedinPACE, corresponding to an estimated 2.2% slower pace of aging in overweight men aged ≥50 years.