I can relate to the issue of concentration. I think this method of shaking up our routine works best for people like us.
I have some friends who rave about fasting. I tried 24 hours and 36 hours. The 24 hours did just that, it made me realize how much I think about eating and how much of my eating is more out of habit and distraction than anything else. The 36 hour one was like "why am I doing this? this is stupid, I can't focus, this is real hunger" haha I will be trying 24 hours again though as it does shake things up and it's not that hard to do.