These short videos explain it pretty cleary.
I’m still annoyed that we were asked to switch from butter to margarine and all the while that’s even worse for your heart. Frustrating how nutritional advice keeps changing. Remember when they said eggs and coconut were bad for you?
Look out for the words partially hydrogenated and shortening. Food companies tend to be sneaky. It’s all about food politics and trans fat allows products to have a longer shelf life and taste better. Again it’s sad that food poorer folks can afford like Fast Food and supermarket staples have the most trans fat while healthy more natural alternatives are very expensive.