Keep in mind that you’ll receive a variety of viewpoints and opinions in a forum, reflecting particular people’s knowledge or lack thereof.
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No, 100% fat adaptation does not happen 6-8 weeks for most people. That is generally a 20 something and/or youngish male timeframe. If one looks at the fact that the demographics of keto/lchf includes TONS of midlife people, midlife + female, along with IR people, as well as midlife + IR people, and midlife + female + IR persons! Dr. Phinney has repeatedly clarified that 100% fat adaptation often takes many months and up to 1 or 2 years in some metabolically deranged folks. I’m not obese, and am 52 y.o. female - and experienced a huge, durable shift between month 6 and 7 that I ascribe to reaching full 100% levels of fat adaptation.
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Until one is fully-fat adapted, calorie counting is basically pointless. It’s not about calories, it’s about establishing the fat burning physiology. AFTER you are 100% fat adapted, then you can cut back on fat if you’ve got body fat you want to burn instead.
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The scale is a heinous illusion - ignore it as much as possible. It doesn’t reflect body recomposition in the non-obese. You’re talking about only “20 pounds” which can also be called something like 25-29% BMI or simply being a bit less lean than you’d like to be (my own range) and keto is gonna prioritize healing your liver, addressing unseen intraabdominal/visceral fat, and restoring atrophied muscle first. Keto will verify your changes far more by measurements changing rather than the heinous scale.