What are trans fats and if they are so bad why do they have to put them I food?

Trans fats. Trans fats were created when manufacturers started turning liquid oils into solid fats -- like margarine -- as a substitute for the saturated fats in butter, cream, & meats that people thought caused heart disease. The process used is called hydrogenation. Later they realized that these products last longer before going rancid. So now, many foods contain this despite ill effects in humans.

Related Questions

What are trans fats and if they are so bad why do they have to put them I food?

Toxic oils. Most trans fats come from partially hydrogenated oils found in many processed & fried foods. They are used because they are cheap, taste good & extend shelf life. They cause inflammation, raise cholesterol & may cause up to 100, 000 deaths in the us from heart disease each year & also increase risk of alzheimer's disease, diabetes, obesity, depression & infertility. See my comment for some links. Read more...
LowerProcessingCosts. The issue is: when double bonds, between carbons, are converted to single, the bond spatial pattern. Lookup in google images: "cis-fat vs. Trans-fat". The vast majority of c-c bonds in fats, & other carbon backbone molecules, are single, aka saturated (no room for more hydrogen side groups). Living cells break double bonds to cis-bonds; industrial hydrogenation lacking control: ½ cis, ½ trans. Read more...