Fasting
I have only tried multi-day fasting seriously once, since I have been on so many adventures that have required more focus...
It is amazing and you will find a two-day 48 hour fast amazing. You may in fact find yourself suddenly dawning a feeling of peace after a lot of chaos.
The trick to intermitent fasting and fasting in general is that you build certain hormones in your body which at some level of your being are turned on around the time you would usually eat during the day.
This rhytm can be broken and your life can be independent of it, with your enjoying making food and choosing when to eat it, and not getting hungry anymore, because you don't need to, over time.
Intermittent fasting thus becomes easier the more you do it, as your body stops sending you signals to eat at the old times because you no longer want them.