Temperate vegetable oils are really, really bad for you. Example bad temperate oil: Canola oil. Temperate plant oil is designed to provide nutrients to the germinating seed at lower temperatures. After it gets warm enough and the seed germinates the oil is no longer needed. So it oxidizes. Oxidation is a serious problem for the mammalian body plan.

Eat only unprocessed tropical oils, extra virgin olive oil or raw unprocessed avocado oil.