The Study
Changes in Plasma, Urine, and Fecal Metabolome after 16 Weeks of Consuming Dairy With Different Food Matrixes - A Randomized Controlled Trial.
This study gave different kinds of dairy to guys with belly fat and checked what chemicals showed up in their pee, poop, and blood. It found that some dairy types changed the chemicals in their poop — but it didn't check if they felt better, lost weight, or got healthier. So we know what changed inside them, but not if it actually helped them.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Scientists tested if yogurt helps your gut because of live bacteria — or because of the sour stuff (lactic acid) in it.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 576 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This means yogurt’s gut benefits may come from lactic acid — not the bacteria — which could change how we make probiotic foods.
- 2People who ate sour milk or cooked yogurt (no live bugs) had the same gut changes as those who ate regular yogurt.
- 3Only regular yogurt raised citrate in blood.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Molecular nutrition & food research
Year
2024
Authors
B. Correia, Karoline Sandby, Thure Krarup, F. Magkos, N. Geiker, Hanne Christine Bertram
Related Content
Claims (6)
Yogurt changes gut metabolites like branched-chain amino acids and isobutyrate even when it has no live bacteria, suggesting that compounds produced by bacteria—such as lactic acid—are responsible for these changes.
Eating 400 grams of dairy products daily for 16 weeks does not change the total amount of short-chain fatty acids in the feces of middle-aged men with abdominal obesity.
In middle-aged men with abdominal obesity, consuming 400 grams of heat-treated yogurt or chemically acidified milk daily for 16 weeks lowers levels of specific waste compounds from protein breakdown in the stool, and this change is caused by lactic acid, not live bacteria.
Middle-aged men with abdominal obesity who consume 400 grams of live-fermented yogurt daily for 16 weeks show higher plasma citrate levels than those who consume heat-treated yogurt or acidified milk.
In middle-aged men with abdominal obesity, changes in metabolic compounds after 16 weeks of dairy consumption are detectable only in feces, not reliably in blood or urine, indicating that gut microbial activity is the main source of these metabolic changes.
Eating fermented dairy products like yogurt does not lead to better changes in gut bacteria than eating non-fermented dairy products like regular milk in people.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.