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by WillPostForFood 2441 days ago
https://www.health.harvard.edu/staying-healthy/the-truth-abo...

The worst type of dietary fat is the kind known as trans fat. It is a byproduct of a process called hydrogenation that is used to turn healthy oils into solids and to prevent them from becoming rancid. Trans fats have no known health benefits and that there is no safe level of consumption.

There are trans fat free margarines now, but historically margarine have been a tub of trans fat.