When male mice eat a lot of soybean oil, their brains make more of a hormone called oxytocin, and more of it shows up in their blood—but less of it is visible in certain brain areas, which might mean their bodies are releasing it differently.

The study found that when male mice ate lots of soybean oil, their brains made more of the oxytocin gene and more oxytocin showed up in their blood, but less oxytocin was stored in the brain areas that usually release it—meaning the hormone was being released differently. This matches exactly what the claim says.