When male mice eat soybean oil instead of coconut oil, their brain’s control center shows more changes in genes linked to swelling, hormone signals, and health problems like obesity — and only one gene, Oxt, is affected in all three ways.

When male mice eat soybean oil instead of coconut oil or a low-fat diet, their brain's hunger and metabolism control center changes which genes are active—and all the soybean oil diets look more alike to each other than they do to the other diets.

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.

Eating a lot of soybean oil over a long time might mess up the brain’s control center for hunger, how your body uses energy, and even how you interact with others.

When male mice eat soybean oil, they develop problems with blood sugar and a brain hormone called oxytocin—but it’s not because of two specific chemicals in the oil (linoleic acid or stigmasterol), since even soybean oil with less of those chemicals causes the same problems, and adding those chemicals to coconut oil doesn’t make the problems happen.