I treat meals like this. If it’s 36 hours or so, I have a normal meal. Today, I made it 36 hours, and went to the gym this morning. I’ll have a meal of 4 eggs, ham, fresh salsa, and grated cheese.
The longer I fast, the smaller the initial meal. If I fast 4.5 days for instance, the last time I did this, I had some chicken broth/stock/bone broth (whatever the heck you want to call it, it’s really stock though) and two pickled eggs. Then I ate a normal meal sometime later.
I do think fasting gets easier with the longer the fast. However, if you listen to Dr. Fung, he makes it sound like it’s easy after the second day. I haven’t found that to be true. It definitely helps if you control your environment for only yourself. If you’re making breakfast, lunch and dinner for kids, if you’re sitting down to a meal with the family where your meal is water, if a coworker makes something that smells good, it’s much harder. This is also the reason I’ve never made it over a weekend. I’d rather eat with the family than fast over a weekend.