No Magic Numbers: The Omega-3:Omega-6 (N3/N6) Ratio - Higher is Better, But as Part of the Standard American Diet Even a 1:1 Ratio Won't Protect You Against Diabesity
|Eating "like an American" makes you fat and sick. No matter what the omega-3 to omega-6 ratio of your diet may be.|
In view of the fact that the study duration was 20 weeks, it would yet take more than 60 (human) years to find out, whether the ratio of n-3/n-6 in the diet is in fact as irrelevant as the reslts Reilly T. Enos et al. present in their latest paper would suggest.
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Ok, the rodent thing is not the only problem
None of the diets contained any long-chain omega-6 or omega-3 FAs. In human terms this would mean that we are not testing a high fish, high grass-fed beef, but a high omega-3 vegetarian diet with tons of alpha linolenic, but no Docosahexaenoic acid (DHA) or Eicosapentaenoic acid (EPA), which is the "stuff" (=long-chain omega-3 fatty acids) you would find in meats of grass-fed beef and, of course, fish.
|Figure 1: Changes in body weight, visceral fat weight and adipocyte size during 20 weeks on modified "standard American diet" w/ different ratios of omega-3 to omega-6 fatty acids (Enos. 2014)|
It does not always work that way.
In reality, though, any therapeutic benefit produced by reducing the omega-6:omega-3 was evident only when comparing the 1:1 to 20:1 HFD. Yep, that's true, the mice on the 1:1 HFD had a lower total to HDL (TC:HDL-C) ratio and a decreased adipose tissue CXCL14 gene expression and adipose tissue macrophage infiltration, both of which would indicate that they had a lower risk cardiovascular disease.
|As a SuppVersity reader you know very well that "A Meta-Analysis Says: Fish Oil Does Not Help You Lean Out!" you do yet also know that the there are also a bunch of arguments "Why It's Still Worth Having Fatty Fish 1-2x/Week" | more|
The net outcome on the other hand, was profoundly disappointing: "[...]despite these effects, and independent of the omega-6:omega-3, all HFDs, in general, led to similar levels of adiposity, insulin resistance, and AT [adipose tissue] inflammation" (Enos. 2014) - in short, it's a sad, but actually not surprising fact that the standard American diet (SAD) will make you fat and diabetic, no matter how much omega-3 fatty acids you are shoveling down.
- Enos, Reilly T., et al. "Reducing the Dietary Omega-6: Omega-3 Utilizing α-Linolenic Acid; Not a Sufficient Therapy for Attenuating High-Fat-Diet-Induced Obesity Development Nor Related Detrimental Metabolic and Adipose Tissue Inflammatory Outcomes." PLOS ONE 9.4 (2014): e94897.