Sorry, unsolicited advice here. I was obese 4-5 years ago.
What helped me was a coworker who told me about his yearly fast, how he prepared and the difficulties (the first two days are the hardest). After the 5-day fast, I found it way easier to ignore my hunger and start IF (now I mostly eat less tbh).
If you want to try, here are my adices:
- If you have big health troubles (if you're diabetic), ask your doctor. It might be a bad idea.
- Do your fast during spring, late spring specifically. Sun helps a lot with mood and motivation
Prepare how you enter the fast.
- The previous 3 days, I was on a mostly ketogenic diet (greens, eggs, poultry, meat, butter, avocado, falafels)
- No medecine. See point 1. Medicine will break your fast. Prior to the fast I took nutrients (vitamin D, magnesium) (I did a blood test before obviously).
- Prepare to drink a lot of water. I added lemon juice in small quantities (for electrolytes, and taste). Tea might be OK too.
- The worst day was the second (the first was easy either). I wasn't able to do anything. Prepare for it, stock interesting books, play video games, find ways to forgot about your hunger. It will physically hurt. Each time it does, drink water. Also, prepare a book rather than screen time on the evening, falling asleep sooner will help.
- Once I passed the second day I was mostly okay. I was pretty tired and weak the 3rd, but I was able to exercise and go out the 4th and 5th (my libido also increased a lot, beware). I stopped the 5th day because it was my object (and I was visiting friends the rest of the week), but I could have lasted longer, and probably worked without issue from the 4th day onward.
Sorry again if it's unsolicited. Hopefully you find something that works for you (and I'll be happy if my dices helped anyone who was in my situation).