"Researchers in France decided to address both of these issues in a recent study among mice fed proportional and realistic levels of fat and tested oils with differing fatty acid composition (albeit in mice). The fats/oils tested included milk fat, palm oil, rapeseed (canola) oil, or sunflower oil.
Regardless of which fat the mice received, fat content as a percentage of diet was maintained at 22.4% (or, 38% of the energy of the diet). Mice were randomly divided into five groups (8 mice per group), and fed one of the five diets (one was a control – i.e., normal mice chow not spiked with fat). Fast forwarding a bit, the researchers found that depending on which oil the mice received, it could change the levels of endotoxins in serum (impaired gut) and increase markers of inflammation (not so good)."
in Palm Oil: maybe not such a good idea after all - Human Food Project