I just finished my first 24-hour fast after doing a few 16/8 fasts. I tracked blood sugar and Ketones throughout:
PREFAST
7:00 pm (before last meal): BGS: 107, Ketones: 1.2
BEGIN FAST
6:40 am (post cardio workout): BGS: 116, Ketones: 1.1
9:15 am: BGS: 122
11:20 am: BGS: 99, Ketones: 1.1
2:15 pm: BGS 92: , Ketones: 1.6
5:50 pm: BGS: 87, Ketones: 2.2
6:45 pm (post cardio workout): BGS: 91, Ketones: 1.9
END
These numbers are about normal with what I get when not fasting, except that I would normally have a BGS spike after eating lunch up to 140, and it will slowly go down over several hours. I also did not measure when I woke up at 5:45 am. My BGS is usually 120-140 a that time and will drop post-workout, but remain at that 120ish level until 10 am. If I don’t work out, it sticks at 140 until 10 am, when it drops.
I think overall this was a great experience. I will do more and longer fasts. At a minimum, the 24-hour fast kept my post-lunch glucose (and probably insulin) spike down, which must be beneficial. I didn’t really get hungry much during the 24 hours. If anything, it was like when I quit smoking–the act of eating is what I craved, but not actually any food.I really feel like making this a longer fast, but my wife made a lot of great food for me this week. (She’s always good to me.) I did eat a large dinner when I broke the fast. I’ll probably do a few more 24-hour fasts before increasing that to 48 hours.
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