Also my first serious fast. I did one for 3 days in college because I wanted to prove a point to a friend (with no diagnosed medical problems) who was convinced she would pass out if she didn’t eat every 2-3 hours. I noticed then that after day 2, hunger went away. The same thing happened this time.
Day one was a normal day. I got hungry a few times, ignored it, and powered through. The hunger didn’t come back worse each time, it just came and went at about the same level. Apparently, if you exercise on day 1 and deplete your blood glucose, you start burning fat faster. I’ll try that next time. Day two must have been the beginning of ketosis because my mouth tasted bizarre, like fake sugar, and I was constantly thirsty. I still got hungry, but less so than on day one.
Days 3-6 were fantastic. I never have energy like that when I eat food. I felt more focused and clear-minded. I didn’t get groggy in the afternoons. I wasn’t hungry. I lost about 1.5-2 lbs a day throughout. This was mostly water weight. I’ve been off the fast now for nearly a week, but I haven’t regained all of the weight. I’m still 2-3 lbs lighter than when I started, which is about how much fat loss I had expected.
One question I do have about fasting to lower insulin resistance is how many times or how long the fasts have to be to show stable changes to the body’s set weight? Theoretically, the body has a set-point for weight which gets nudged higher as insulin resistance builds. But when insulin resistance goes down, does this set-point decrease as well? Is it harder to decrease it than increase it?
After the science, my second favorite thing about fasting to lose weight and improve health is its simplicity. It appeals greatly to the sloth in me to be told that 95% of weight loss depends on diet (and only 5% on exercise). It is wonderful not to have to cook. Or clean up after meals. Or think about what to eat. Or shop for it. Modified versions with “eating windows” are simple too: eat 1-2 meals between these hours and never at any other time in between. How easy is that?
Another thing I love about this diet: I have enough fat stores to see me through a week-long backpacking trip. How wonderful not to have to pack anything to eat. Or a trip to one of these tropical islands with over water bungalows and exactly one severely overpriced restaurant. I can go for week-long vacations and never have to worry about eating! I’ve never before been so pleased about my fat stores. Finally, they’re useful for something.