Dairy fat and fermentation: surprising effects on gut bugs and heart risk?

NCT ID NCT05840081

Completed Knowledge-focused Sponsor: Tufts University Source: ClinicalTrials.gov ↗

First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at how full-fat and fat-free milk and yogurt affect the gut microbiome and heart disease risk factors. 37 adults over 50 drank specially prepared dairy drinks for a period. Researchers measured changes in gut bacteria, metabolic byproducts, and blood markers to see if fat content or fermentation makes a difference. The goal is to improve dietary advice for heart health.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Milk or yogurt beverage
What this could lead to: If successful, this could help refine dietary guidelines for heart disease prevention by clarifying how dairy fat and fermentation affect gut health and heart risk.
What could go wrong: This is a small, completed study (37 participants) that measures biomarkers, not clinical outcomes. Results may not apply to younger people or those with different diets.

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Conditions

The condition(s) this trial relates to.

heart disorder infectious disease Inflammation inflammatory disease

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

HEART DISEASES INFLAMMATION MICROBIAL COLONIZATION

Contacts and locations

Locations

Jean Mayer Human Nutrition Research Center on Aging

Boston, Massachusetts, 02111, United States

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