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Dear Eric,

thank you for the informative article! I still wonder about something (maybe it can even be some input for the book): You say that there is an “initial 1–4 week period of fatigue, irritability, and decreased performance when adopting a low-carb diet that subsides after adaptation” but then you recommend trying 40% for one month = 4 weeks and comparing it to 4 weeks of 20% fat. If someone who followed your recommendations was one of those people who need 3 to 4 weeks for adapting to low-carb, wouldn’t their comparison results be highly confounded by the adaption process? Why not 2 months low-carb and then 1 month high-carb (assuming that adaption is easier the other way around)? 6 months total is still a drop in the bucket, after all.
Just something I noticed, I’ve never tried a low-carb diet though so maybe I’m overlooking something here.

Kind regards from Germany

Eric Helms
Eric Helms

Leo, that specifically refers to ketogenic, or very low carb diets, closer to 60%+ calories from fat, that shouldn’t occur at all at 40% fat so not an issue!

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