The field of fat, and what is proper to ingest, still has many unanswered questions. What is unequivocal is that trans fatty acids, hydrogenated and partially hydrogenated oils commonly found in processed foods, are harmful and should be avoided at all cost. Food makers popularized trans fats because they have a long shelf life and do not go rancid easily. Rancidity means the fat is oxidized. Oxidized fat is harmful to the body.
