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20/4 IF is the most I have gone and probably feel comfortable with. After about 30 hours, I would be concerned about catabolizing lean mass, a no-no. At least that's what the studies have shown. Cycling carbs/kcals is something I need to explore, but need a strict template to follow.  Winging it ain't gonna cut it. And I agree, staying in a deficit for too long = thyroid suppression.