I think they're referring to sunflower oil's absence of Omega-3s. Per Wikipedia [1]: > The ratios of omega−6 to omega−3 fatty acids in some common vegetable oi

I think they're referring to sunflower oil's absence of Omega-3s. Per Wikipedia [1]: > The ratios of omega−6 to omega−3 fatty acids in some common vegetable oils are: canola 2:1, hemp 2–3:1, soybean 7:1, olive 3–13:1, sunflower, flax 1:3, cottonseed (almost no omega−3), peanut (no omega−3), grapeseed oil and corn oil 46:1. My understanding is that there's some Omega-6:Omega-3 ratio to shoot for, and most western diets are far more biased toward Omega-6, so adding some Omega-3 (sardines) along with a bunch of Omega-6 and no Omega-3 (sunflower oil) would actually work against that goal. [1] https://en.wikipedia.org/wiki/Omega-3_fatty_acid#Plant_sources https://en.wikipedia.org/wiki/Omega-3_fatty_acid#Plant_sourc...