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Disclaimer: Intermittent fasting is considered a controversial topic by some AND depending on your health may not be a good idea- so you are responsible for checking with your doctor or medical professional before doing this. I am not a medical professional and the following are just my opinions based on my own experience and the research that I've done. There are quite a few books that expound on both the history and proof of the efficacy of fasting and I firmly believe in it's use, when done the right way, myself.
When Your Body Just Ain't Having It
You may notice times when you mentally decided to fast but it's feeling like MUCH more of a struggle that day - ie distracted and weak from hunger.
This could be because your period is coming, or your body is really tired from something stressful- there could be any number of reasons honestly- but you'll know it when it's happening.
I have this happen from time to time and in these cases I feel it's wise to listen to your body in this regard and break your fast early.
Now this is DIFFERENT from a few intense huger pangs that pass - it's very typically to get hunger pangs when you normally eat- so say lunch time- the hormone called Ghrelin is what causes those actual physical tummy rumblings- but usually, you will notice that if you wait it out just like 20 minutes- seriously- the feeling completely passes and you go back to not being hungry (stomach still empty- but not feeling like man I'm hungry grrr).
So when its' a day where I truly can't seem to handle it in a positive way, I will get hungry around noon and then by 1 it's like I'm feeling more and more out of it/distracted and can't focus - that's when I know this isn't a good day to do this.
I will break the fast, eat lunch, and then fast another day- possibly even the following day or day after depending on how I'm feeling and my schedule that week.