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Originally Posted by lil' annie
I am very curious to learn if Dr. Jan Kwasniewski ever mentions anything about fructose in his books.
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I'll have to check on that.
ON recommends starches over sugars, but doesn't seem to say much about fructose per se, except to point out that it gives slightly less energy (only providing 3.73 kcal/g when burned in the body, vs. 3.91 for sucrose and 4.12 for starch). But I'm pretty sure there's a fair bit about it in
Homo Optimus, especially in the section on diabetes.
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Also, does he ever specifically explain why he believes starches - such as potatoes, to be a good carb source?
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It's because they're efficient; they give you the fuel without the bulk. They're also convenient and cheap. This is why he includes white flour in many of the recipes. He's well aware that there are fewer vitamins and minerals in refined grains, but given that plant foods are such a tiny part of the diet -- and dairy, eggs, broth, and offal are so rich in micronutrients -- he's not concerned about this. He believes that the slight loss of vitamins is more than offset by the benefit of not stuffing up your gut with fiber.
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Any direct mention of limiting fruit? How about limiting any vegetables?
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Vegetables, whether starchy or non-starchy, are limited to a certain amount; I think it's 300 g per day (will check on this). If you're counting net carbs only, it seems as if it would be easy to go over that limit if you mainly ate bulky salad vegetables, etc. European food labels apparently state the net carbs when they say "carbohydrate," so it would seem that that's how he expects us to calculate them, but AFAIK nobody on this board has been able to verify this for sure.
Okay, here's something I just found in
ON:
"While on the topic, it is important to realize that fruits and vegetables contain very few carbohydrates. To ingest 50 grams of carbohydrates, it would be necessary to eat around 6 1/2 pounds of lemons, 6 pounds of dill pickles, or 5 pounds of spinach."
Fitday says that 5 lb spinach has 82 g carbohydrate, of which 50 g is fiber, which would give 32 net carbs.
6 lb dill pickles has 71 carb - 30 fiber = 41 net carbs.
(The figures for lemons seems to be for peeled fruit, and I think he's talking about the edible portion from 6.5 lb unpeeled, so I'm not going to try to wrap my head around that.)
So, the numbers don't really match up either way -- maybe they do their measurements differently in Europe? There's a 9 g & 18 g discrepancy for net carbs, vs. a 32 g & 21 g discrepancy for total carbs. Given this information, I'm betting on net carbs, as they're much closer.
As for fruits, I don't recall him mentioning limiting them (except in cases such as diabetes), but I'll check. He does say that it's preferable to discard the fiber, e.g. by making fruit into jelly and throwing out the pulp.