The True Shelf Life of Cooking Oils
Cooking oil manufacturer “best-by” dates are put to the test by comparing the development of rancidity between almond oil, avocado oil, hazelnut oil, macadamia oil, grape seed oil, rice bran oil, toasted sesame oil, and walnut oil. Find out which oil starts going rancid within just a few weeks in my NutritionFacts.org video pick for the day, above.
The best way to keep and consume walnut oil is, of course, within the walnut itself. In my Care2 video What Should Women Eat to Live Longest? I noted that the Harvard Nurses Health Study found that eating just two handfuls of nuts per week may extend a woman’s lifespan as much as four hours of weekly jogging.
Which kinds of walnuts are best, though? Black walnuts or English—also known as common—walnuts? I would have guessed black just based on their rich flavor and color, but I would have been wrong. In a study I profile in my 2-min. video Black Versus English Walnuts, when subjects were given a salami and cheese sandwich on white bread smeared with 2 spoonfuls of butter and then a big handful of either black or English walnuts, something very different happened.
When we whack our arteries with that kind of load of saturated animal fat, within hours our blood vessels become inflamed and stiff. Eating English—but not black—walnuts with the salami sandwich appeared to diminish the damage, which perhaps relates to the finding that English walnuts have nearly 10 times the antioxidant capacity of black walnuts.
The anti-inflammatory power of certain nuts is really quite astonishing. See my 2-min. video Fighting Inflammation in a Nutshell and my Care2 post Dietary Treatment for Crohn’s Disease for other anti-inflammatory foods.
I explore why meat and dairy tend to be so inflammatory in my three part video series The Leaky Gut Theory of Why Animal Products Cause Inflammation, The Exogenous Endotoxin Theory, and Dead Meat Bacteria Endotoxemia. I also give an abbreviated summary of it in my full-length “live” presentation Uprooting the Leading Causes of Death.
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Michael Greger, M.D.
Image credit: @kevinv033 / Flickr