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Niklas...not that I can find. I don't have access to these studies that stephen does though, so I don't know. And I'm not going to pay $20 just to look at them.
To be honest, I have never taken a single college level science class. I don't know much about biology and how things work in your body once ingested. But, even with my limited knowledge, it does not make sense that there is max damage at 4% of calories. If it was maybe a percentage of fats in general, or something like that, I could maybe rationalize it. But how would ingesting extra protein or carbs (adding calories to your diet thus making your percentage of n-6 lower) would have any effect on how much damage is done by n-6. Maybe there is some biological reason for this assertion that I am missing, but it just doesn't seem right.
According to Stephen, the omega-6 HUFA in tissue maxes out at 4% of calories. Why this isn't a specific number of grams I don't know.
Either way I don't think it is that big of a deal. Nuts and olive oil have been proven time and time again to be heart healthy. And the omega 3:6 ratio does not seem to have the studies to back it. So in my opinion eating nuts and olive oil is a good idea.
Last night I tanned a whole bag of roasted cashews. That's over 1000 calories worth of nuts, and with some sunflower oil thrown in for good measure. So tasty, but the horrible veg oil aftertaste (which I can still taste now!) and slight feeling of sickness puts me off doing it again. If that's beneficial to my heart then all the better, although the sunflower oil probably cancelled out any benefit from the nuts!
Anyway I see nuts as a semi-treat, kinda like fruit: they may have some benefit but the negative aspects rule out making them a staple. Main reason I got them last night was because I had already eaten SO MUCH MEAT that day so wanted a change! And the reason I ate the whole pack... Well, they're addictive, and I had to occupy myself somehow during the long walk home....
Nobody seems to have mentioned soaking nuts in this thread yet, unless I missed it. Soaking nuts overnight in salt water is supposed to kill off the antinutrients (phytates), making them slightly healthier. Sometime I'm gonna get some raw cashews, soak them, roast them, and add salt and pepper (but no veg oil!!). The result should be tastier and healthier than the supermarket crap I had last night.