When rats eat extra virgin olive oil, their stomachs stay fuller longer and they eat less over the next day—this might be because their stomach stretches out, which tells their brain they’re not hungry.

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Evidence from Studies

Supporting (1)

10

Community contributions welcome

10

Brain Perception of Different Oils on Appetite Regulation: An Anorectic Gene Expression Pattern in the Hypothalamus Dependent on the Vagus Nerve

Randomized Controlled Trial

Animal

2024 Jul 24

The study gave rats olive oil and found their stomachs stayed fuller longer and they ate less over the next day — 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

Brain Perception of Different Oils on Appetite Regulation: An Anorectic Gene Expression Pattern in the Hypothalamus Dependent on the Vagus Nerve

Score: 10

DOI: 10.3390/nu16152397

Similar Assertions

In rats, cutting the vagus nerve (a brain-gut connection) stops olive oil from making them eat less, but makes palm oil make them eat even less than before — which is weird and surprising.

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When rats eat palm oil, their stomachs hold onto the food longer after 3 hours, but they don’t eat more or less over the whole day — so fullness doesn’t seem to control how much they eat.

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71%