As an intermittent faster I would recommend you break yourself into it and allow your body to adjust. I started by not snacking in between meals for a few days. Once I’d successfully accomplished that I tried a 16/8 fast. That’s 16 hours fasting and then 8 hours with 2-3 meals, no snacking in between. A few weeks later I moved up to a 20 hour fast with a 4 hour window for 2 meals. Once I did that a few weeks later I went to a 24 hour fast, 1 meal and then a 24 hour fast…Beyond that I have successfully done a 72 hour fast. Most researchers agree that 72 hours gives your immune system a reset, completes autophagy, and reduces insulin resistance. Take supplements that will not break your fast like nutritional yeast, calcium citrate with magnesium and a bit of Himalayan salt in water for minerals. Lemon water will also not break your fast. And drink plenty of water as you fast to flush your system out, I can recommend a doctor on youtube who has dozens of videos on this subject if you’d like.