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    Home ยป Learn About Paleo & Keto Diets

    PUFA and Heart Health

    Last Modified: Feb 2, 2023 by Paleo Leaper ยท This post may contain affiliate links ยท Leave a Comment

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    The close cousin of โ€œartery-clogging saturated fatโ€ is โ€œheart-healthy canola oilโ€ โ€“ which should be your first clue that maybe all those suspiciously cheap bottles of golden liquid arenโ€™t so great for you after all. And indeed, one of the central tenets of Paleo has always been that seed and vegetable oils โ€“ soy, canola, peanut, and the rest of the crew โ€“ are major contributors to modern disease.

    But how, and why? Itโ€™s not just because theyโ€™re โ€œunnaturalโ€ (that word is almost meaningless anyway); itโ€™s because theyโ€™re very high in polyunsaturated fat (PUFA), specifically the Omega-6 type.

    PUFA is such a big Paleo issue that itโ€™s already been covered in several places, notably here. But one other aspect deserves a look: the line that just wonโ€™t die about polyunsaturated fat being โ€œgood for your heart.โ€ So hereโ€™s a quick review of what PUFA actually is and why it can be a problem, and then a hard look at whether or not it really benefits heart health. (If you already know basically what PUFA is, feel free to skip to here.)

    What Is PUFA?

    Without getting into all the molecular details, PUFA is a type of fat thatโ€™s chemically unstable. In other words, it easily goes rancid when itโ€™s exposed to heat (deep-frying, grilling, etc.) or light (sitting in a clear bottle on the shelf in the grocery store). There are two major types of PUFA:

    • Omega-6 PUFA, found abundantly in nuts, seeds, soy, and oils made from them (including โ€œvegetable oilโ€).
    • Omega-3 PUFA, found abundantly in fish and seafood, with smaller amounts in fat from grass-fed animals.

    We can also get the precursors for Omega-3s from plant sources (like flax seeds), but human bodies just arenโ€™t very efficient at converting those precursors into Omega-3s themselves, so itโ€™s better to get the Omega-3s directly.

    Whatโ€™s Wrong with PUFA?

    In a nutshell: too much Omega-6!

    The problem isnโ€™t that Omega-6 fats are โ€œbadโ€ in the abstract. We actually need them: if we donโ€™t get them, weโ€™ll die. But we donโ€™t need a lot of them.

    As far as we can tell, the ratio of Omega-6 to Omega-3 in ancestral diets was something between 1:1 and 4:1. But in modern diets, itโ€™s around 10:1, thanks to the amazing amount of vegetable oils we eat.

    This imbalanced ratio of Omega-6 to Omega-3 fats is a problem because itโ€™s inflammatory. The inflammation from excessive Omega-6 exacerbates all other kinds of inflammatory health problems, including familiar faces like obesity, diabetes, autoimmune diseases, depression, and heart disease. Itโ€™s not that PUFA overload really causes any one particular disease; itโ€™s that it gives all kinds of other diseases a nudge in the wrong direction.

    But if Omega-6 fats are so inflammatory and unhealthy, then why do they get such a good reputation as โ€œheart-healthy?โ€ As it turns out, theyโ€™ve really been piggybacking on the Omega-3s!

    Does PUFA Improve Heart Health?

    This is the idea behind that โ€œheart-healthy canola oilโ€ line, but actually itโ€™s much more complicated. This study gives a good summary:

    โ€œโ€ฆa recent meta-analysis found that interventions [replacing saturated fat with] mixed ฯ‰3 and ฯ‰6 PUFAs resulted in a significant (22%) decrease in CAD events compared with control diets with fewer PUFAs. However, interventions that used ฯ‰6 polyunsaturated oils with no ฯ‰3 PUFAs showed โˆผ16% more cardiovascular events compared with the control dietsโ€ฆโ€

    In plain English: adding Omega-3s and Omega-6s is beneficial. Adding only Omega-6s is harmful. And thatโ€™s not surprising at all when you think about what it actually means in terms of ratios.

    In the modern American diet, adding any amount of Omega-3 would probably improve the ratio of Omega-3 to Omega-6. For example, using the numbers from this paper and assuming a 2,000 calorie diet:

     Omega-6 contentOmega-3 contentO6:O3 ratio
    Estimated Paleolithic/hunter-gatherer diet  Between 1:1 and 4:1
    Current US diet16 grams/day1.6 grams/day10:1
    Add 1 gram of Omega-6 and 1 gram of Omega-317 grams/day2.6 grams/day6.5:1

    In other words, these studies donโ€™t show that eating more PUFA is good for you. They really show that improving the ratio of Omega-6 to Omega-3 fats is good for you. The American diet is so astonishingly deficient in Omega-3 fats that people still benefit from adding them even when they come along with Omega-6s. But that doesnโ€™t mean the Omega-6s are healthy!

    PUFA By the Numbers

    The next big question, of course, is โ€œwhat does this actually mean in real food?โ€ Nobody eats grams of PUFA; people eat fish, or almonds, or tofu. And unless you really love doing nutritional math, you probably want to know what a healthy fat intake is in the real world.

    Unfortunately, easy numbers are hard to come by. Itโ€™s not quite clear exactly what the ideal ratio of Omega-6 to Omega-3 is, much less how to get it. And all of us have better things to do than obsessively tally up our almond intake. But here are some general guidelines:

    • Avoid soy, โ€œvegetable oil,โ€ peanut oil, corn oil, canola oil, and other highly concentrated sources of Omega-6 fats, especially if theyโ€™ve been deep-fried or otherwise exposed to extreme heat.
    • Eat nuts and seeds in small amounts, not as staple foods.
    • Eat plenty of fish and seafood โ€“ approximately 1 pound of fish per week is a good goal.
    • Do not just add more Omega-3s onto a diet rich in Omega-6s to โ€œbalance it out.โ€ This doesnโ€™t work. You cannot โ€œeraseโ€ the effects of a bunch of tofu by slugging down a shot of fish oil. Instead of adding more Omega-3s, lower Omega-6s.
    • Keep it proportional. Most foods that contain fat contain a little Omega-6, but thereโ€™s no call to go crazy over olive oil and avocados. Before you avoid a food for fear of Omega-6 fats, look up exactly how much it contains: you might be surprised at how little it actually is.
    Fish Paleo

    Summing it Up

    Canola oil is not a health food โ€“ especially not for your heart. The line that โ€œPUFA lowers cholesterol/reduces the risk of heart diseaseโ€ is true only if โ€œPUFAโ€ includes Omega-3 and Omega-6 fats: Omega-6s on their own are likely to make the problem worse.

    For overall health, a good general plan is to keep overall PUFA intake low, especially the Omega-6s. Ditch the seed and vegetable oils and all the soy products, and keep nuts and seeds to small amounts. Make sure youโ€™re getting enough Omega-3s by eating plenty of fish and other seafood, but donโ€™t try to โ€œmake up forโ€ too much Omega-6 by piling on more Omega-3s: it doesnโ€™t work that way!

    Most importantly, donโ€™t stress out over otherwise nutritious foods just because they have some Omega-6. As long as youโ€™re avoiding the biggies (seed oils and soy) youโ€™ll probably be just fine. Enjoy plenty of Paleo-friendly fats like olive oil, coconut oil, and animal fat, and try to have some kind of seafood at least once a week: your Omegas will take care of themselves.

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