I’m vegan and I weigh ~110lbs. There is some fat there but I have often wondered whether having more would make the process easier.
I think it depends largely on what your meals are like leading up to a fast. This time around I cut out carbs like rice and I didn’t snack on junky snacks like chips or Oreos, which I occasionally have. I added more fat to my diet in the form of nuts and made sure to only eat fresh veggies I prepared myself. I had tofu as my protein the last two days (for no reason it’s just what I had). I’m 70-something hours in and it’s been so much easier this time.
I also gave up coffee. I’m using caffeine pills to wean myself off so it wasn’t a sudden change. This has also really helped.
I don’t drink alcohol, soda or eat much highly processed foods. Salted chips and Oreos are the only ones and even then it’s not every week.