In addition, the blue zone study (largest epidemiological study ever conducted on human health) concluded that diets rich in whole grains, starchy root vegetables, legumes, fruits, nuts and seeds proved to result in the lowest instances of diet related diseases (heart attach, stroke, diabetes, alzheimers) and was found to increase longevity.
"From this There is abundant evidence that increased levels of plasma lipids, predominantly free fatty acids (FFAs) and triglycerides, are causally involved in IR" (insulin resistance)
Sources: http://diabetes.diabetesjournals.org/content/52/1/138
More recent sources: http://www.cbc.ca/news/health/canadian-researchers-fat-carbo...
To wit: there is a dramatic difference between the types of fats that should increase in our diets, versus the types of fats that should decrease.
It certainly isn't about reducing the proportion of whole grains, nuts, and seeds to the proportion of other sources of carbohydrates. If anything, when talking about fats, nuts and seeds are included in that argument. I spend more on my breads these days precisely because of this -- as part of my diet I require the increased iron and fats contents of whole-grain breads that include nuts and seeds. I've also taken to eating less of that bread, and spend more time snacking on nuts -- especially at work.
I can't however speak from the perspective of somebody with insulin issues or diabetes. I'm closer to anemic in my dietary needs.
The alternative to this being athletes. We had to carbo-load the night before a game/race/etc -- but not on the regular.
I think those caps are meant to nudge people in the direction of getting their nutrients from non-processed food sources. It's somewhat more reliable to maintain a healthy intake of nutrients by eating food versus supplementation. [1]
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[0] https://beta.theglobeandmail.com/life/health-and-fitness/som...
[1] https://www.health.harvard.edu/staying-healthy/should-you-ge...