Summary
This 2019 narrative review by den Hartigh, published in Nutrients, consolidates pre-clinical and human trial evidence on the biological effects of conjugated linoleic acid (CLA) — a group of fatty acids naturally occurring in ruminant-derived foods including dairy and meat. The review evaluates CLA's purported anti-carcinogenic, anti-obesity, and anti-atherogenic properties, noting that while animal model data are often promising, findings from human trials are more equivocal and context-dependent. The paper provides a current perspective on the translational gap between laboratory evidence and clinically meaningful outcomes in human populations.
UK applicability
The findings are broadly applicable to UK nutrition policy and dietary guidance, particularly given the role of grass-fed dairy and beef in the UK food supply as primary dietary sources of CLA. UK consumers and policymakers may find this review relevant when assessing health claims associated with pasture-based animal products.
Key measures
Tumour incidence and growth; body fat mass and body composition; lipid profiles (LDL, HDL, triglycerides); markers of atherosclerosis; insulin sensitivity; inflammatory biomarkers
Outcomes reported
The review examines the effects of conjugated linoleic acid (CLA) on cancer risk, obesity-related metabolic outcomes, and atherosclerotic cardiovascular disease across pre-clinical animal studies and human clinical trials. It synthesises evidence on the efficacy and safety of CLA supplementation and dietary intake across these three health domains.
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