I was used to eating once or twice a day, already, while still a (tremendous, sometimes relentless) carb-eater.
Couple cups of black coffee in the morning, then a big meal in the evening - that was often the deal.
Scared by a diagnosis of type 2 diabetes, I plunged into ketogenic eating and fasting. At the end of the first week, I fasted for 4.5 days before getting worried about it being Sunday and that I’d have to go to work the next day; “I better eat…” and I did. Needless fear that I might not feel well enough, I later realized.
On the 3rd day of that fast, my feet felt a little cold that night - it actually felt good to get under the covers in bed. On the 4th day, I felt fine and warm again, and that’s when I knew I was doing pretty well at burning fat.