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This article is from the Food Science
FAQ, bypking123@sympatico.ca (Paul E. J. King) with numerous
contributions by others.
13. What are trans fatty acids?
Unsaturated fatty acids in foods can exist in two
differently-shaped forms, scientifically described as the cis and
trans forms. Some trans fatty acids are naturally found in milk and
butter. When oils are hydrogenated, the unsaturated fatty acids
become partially-saturated though retaining a degree of unsaturation.
In the course of this, these still partially-unsaturated fatty acids
have, to some extent, become converted to the trans form. While some
research suggests that trans fatty acids may be harmful, the evidence
is somewhat conflicting. As yet there is no official guidance on the
subject, other than that the amount currently consumed should not be
increased.
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