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Hi Jim. You are absolutely correct, and I followed this diet for a long time but caused myself a few problems. An endocrinologist told me you also need the correct amount of cortisol and thyroxine for your metabolism to function correctly.
Eating low calorie as well as low carb (<20g per day) as has been posted, may eventually cause your thyroid to slow your metabolism by producing reverse T3, which I did and this was in my blood test results. I only say this as I wouldn't like anyone to go through the problems I did. I carried on with the diet but increased the carbs to a minimum of 20g carbs per day, not much, following the endocrinologists advice, this worked for me. I would now say I am slim and have maintained this for over a year. I do think we are all different with different tolerances, but better to have as much knowledge as possible. The book I mentioned also talks about this. You are absolutely correct in what you say but it's whether your thyroid has an adverse reaction that may muddy the waters.
Sure thing, but don't forget it's not necessarily all about calorie intake. People who are eating low-carb, and have sufficiently low circulating insulin, will almost certainly be in some level of dietary ketosis. This means that they will be pulling any shortfall in energy from their stored body fat (hence no hunger). That is, after all, why it's there. If someone is hungry then of course they should eat, but if they're not, then their body has sufficient fuel and nutrients currently available. Hunger should be the driver of what we eat and when we eat it, not numbers, macros and charts.
But yes it goes without saying that we all have a way of eating where we feel our best and perform optimally. I'm not prescribing anything one way or the other, but I don't think it's true that low carb will necessarily cause any metabolism issues, which was the original point I addressed.
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