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The new evidence proves, says Cook, that the dietary ingredient "is pretty amazing." A food pyramid good trans fat Linoleic acid is a molecule with a backbone of 18 carbon atoms, most of them linked by single bonds. At two sites, those carbons are linked by more-rigid double bonds. If chemical reactions shift those double bonds so that they are separated by only one food pyramid single bond, the molecule is described food pyramid as having conjugated double bonds. And that's what CLAs are—a linoleic molecule whose double bonds are now conjugated. Fats will bend at the site of a double bond. Ordinarily, linoleic's two double bonds are both in what chemists refer to as a cis configuration. This means that the carbon backbone takes on somewhat of a U-shape around each bond. In CLAs, however, one of the double bonds instead sports a trans configuration, meaning that the bond induces a slight zigzag in the backbone (SN: 11/10/01, p. 300: Available to subscribers at http://www.sciencenews.org/articles/20011110/bob13.asp).
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