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Trans-fats

Structure

Unrefined fats include double bonds in the carbon chain, which lead to a molecular structure which is not a straight chain. Upon hydrogenation, single bonds are formed in place of double bonds, with a strong preference for the formation of trans-hydrocarbon backbone rather than cis-bonds. Such molecules have a more linear structure.

Hydrogenated oil

Partial hydrogenation changes a fat’s molecular structure (raising its melting point and reducing rancidity), but this process also results in a portion of the changed fat becoming trans fat.

Effects

Trans facts tend to accumulate and eventually harden in blood-vessels, particularly in the heart and the brain, leading to heart disease and higher blood pressure.