Original title: An Increase in the Omega-6/Omega-3 Fatty Acid Ratio Increases the Risk for Obesity
The paper looks at omega-6 and omega-3, two kinds of fatty acid in food and body tissues. It reports that Western diets shifted toward more omega-6 and less omega-3, and that obesity became more common over the same period. Studies described in the abstract link higher omega-6 levels and a higher omega-6-to-omega-3 ratio with greater obesity risk, while higher omega-3 levels link with lower risk. The authors discuss possible body processes behind these links, including inflammation and signals between the brain, gut, and fat tissue.
Imagine packing lunch for a long day, with some space for one kind of snack and some for another. If you keep adding one and cutting back the other, the balance of the bag changes, even if the total amount stays similar. In this paper, the two snacks stand for omega-6 and omega-3 fats, and the changing balance stands for the ratio linked in the studies to obesity risk.
People often focus on how much fat they eat, but this paper focuses on the balance between two kinds of fatty acid. It suggests that this balance may matter for obesity risk, while also noting that evidence comes from several types of studies.
The abstract describes links from prospective studies and mechanisms suggested by experimental and human studies, but does not establish that the fatty-acid ratio alone causes obesity. It gives no study sizes, effect estimates, or details about how well increased EPA and DHA intake changes obesity outcomes.
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An Increase in the Omega-6/Omega-3 Fatty Acid Ratio Increases the Risk for Obesity — Artemis P. Simopoulos — Nutrients — doi:10.3390/nu8030128
Abstract licence: CC BY
Explanation generated by Synthesis from the abstract — it is not the original paper.