Summary
This 2001 narrative review synthesises evidence on the distinct biological activities of two major conjugated linoleic acid (CLA) isomers found in dairy and beef products. The authors demonstrate that trans-10,cis-12 CLA primarily affects body composition through inhibition of adipocyte lipid uptake, whilst cis-9,trans-11 CLA—the principal dietary form—enhances growth and feed efficiency via separate mechanisms. Both isomers show anti-carcinogenic activity in animal models, and the review presents evidence of direct biochemical action rather than metabolite-mediated effects.
Regional applicability
The findings are internationally applicable as CLA isomer profiles in United Kingdom dairy and beef products would similarly depend on cattle feed composition. The mechanistic insights into isomer-specific effects are relevant to UK nutritional guidelines and food composition databases, though the review does not directly evaluate United Kingdom dietary intakes or health outcomes.
Key measures
Adipocyte lipid uptake, lipoprotein lipase activity, stearoyl-CoA desaturase activity, body composition, growth rate, feed efficiency, carcinogenesis inhibition in animal models, hepatic lipid metabolism in cultured cells
Outcomes reported
The review distinguishes physiological effects of cis-9,trans-11 and trans-10,cis-12 CLA isomers, identifying separate biochemical mechanisms: trans-10,cis-12 reduces adipocyte lipid uptake and affects hepatic lipid metabolism, whilst cis-9,trans-11 enhances growth and feed efficiency. Both isomers inhibit carcinogenesis in animal models.
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