By excessive I mean I don't drink bulletproof coffee or purposely ingest more than seems to come naturally. For example, I'll use a pat of butter on vegetables, but I don't add more. I'll eat a fatty cut of meat, but I only have a 4 ounce portion of meat. I have HWC in my coffee, but not 2 Tablespoons. I fry turnips in olive oil to mimic french fries, but I still blot them on paper towels, and only eat a small portion.
The theory (Dr. Westman I think) is that part of your fat intake should also come from your own "on-board" fat, and that if you eat too much, your body has no reason to access it's own stores. But, you need to eat, and if you're moderating both carbs and protein, you do need those fat calories. So it's a balancing act that each person has to figure out for themselves. I shoot for about 5% carbs, 70-75% fat, and 20-25% protein.
I'm no expert here, although I've read many books and articles on the subject. I especially like Jason Fung's two-compartment model on insulin resistance.
20 carbs is not a lot, but I'm so used to it now, it's starting to seem normal. If I just stick to the bacon, eggs, salad, veggies, meat -- I'm good. It's when I add the cheese, cream cheese, macadamia nuts, turnip fries, minute muffins, almond flour baked goods, low carb beer, wine, and even snack between meals that my weight loss will slow down if I overdo it. I can somewhat mitigate that with the intermittent fasting, but that's not a magic bullet if I start going over the 20 carbs again.
I agree that if you just stick to induction foods, and don't go out of your way to add extra fat, you'll probably be below 80% -- it's definitely worth a try.
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