I try to eat within a four-hour window most days. There is a lot of diabetes in my family (LOTS!) and I was prediabetic more than 50 years ago, so I walk the line. : ) Post-ileostomy a lot of what I eat is way too carby for someone with my risk factors, and I control that with the intermittent fasting. It works. With that and walking, my last A1c was 4.7, and sometimes it goes as low as 4.6. No diabetes there!! And that's with my crap food diet, so . . .
I am not religious about it though. I take my morning supplements with applesauce. And I use Bulletproof coffee to keep me running during the day, a big cup in the morning and another if I start to get hungry or run out of energy. So it is easy for me to adhere to, because my energy is good and I am not tired! You have to adapt to the Bulletproof coffee though so give yourself a week or so. Same with the intermittent fasting, you kind of have to increase the fasting hours at your level of comfort, you don't start out going 20 hours with nothing but a little applesauce and Bulletproof coffee!!
The good news is that it really does work. And when I feel like it, I eat ice cream with my grandkids and take-out of the dishonorable variety. : ) I don't adhere perfectly, but then again, I don't need to. It is easy to live with way and it really does promote overall better health, too. So yes, it works, no, you don't have to be perfect about it, yes, give yourself some adaptation time, and yes, please give Bulletproof coffee a spin, it is amazing, at least for me. : )