Cows might make fattier milk at night because their gut bacteria and body chemicals change with the time of day.

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Evidence from Studies

Supporting (1)

6

Community contributions welcome

6

Circadian Rhythm Enhances mTORC1/AMPK Pathway-Mediated Milk Fat Synthesis in Dairy Cows via the Microbial Metabolite Acetic Acid.

Cross-Sectional Study

Animal

2024 Dec 18

The study shows that cows produce fattier milk at night because their gut microbes change and send more acetic acid into the blood, which helps make more fat in milk—just like the claim says.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Circadian Rhythm Enhances mTORC1/AMPK Pathway-Mediated Milk Fat Synthesis in Dairy Cows via the Microbial Metabolite Acetic Acid.

Score: 6

DOI: 10.1021/acs.jafc.4c07488

Similar Assertions

When certain gut bacteria in cows are more active at night, it might help them make milk with more fat — kind of like how our body uses food differently depending on the time of day.

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