GofouritG1RL, I did build up to it. I began with an simple 16:8 routine, which was easy because I’m never hungry in the morning anyway, and did that for months. It was almost a full year, in fact, before I attempted my first extended fast in July 2017. It was 48 hours long and managed to tack on a few hours on top of that. I respond to it very well right away. The next month it was 72 hours. The month after that 76, etc.
I’ve never experienced the headache problem, but my OH did. For the first 48 hours it was pretty much constant. He was also avoiding caffeine so I’m sure that played a role as well as he is accustomed to at least two cups of morning coffee. It’s a glycogen thing, in his case, because he isn’t really a low carber except insofar as he eats what I eat, but the day before we started he had a burger, fries and a giant slice of almond cake, bless his heart. I told him you’d had the same headache problem and he pointed out you can always take over the counter pain remedies, just be sure they aren’t the same kind. So for example have an Alleve, an Advil and a Tylenol, not three Tylenols or three aspirin. That’s what he did on day two and it worked like a charm. By the third day his headache was gone and he woke up feeling completely different. Making it to the 5th day has changed his understanding of hunger, something that has been a constant in his life since he was a small child, permanently.
To answer your question, I don’t nibble on anything. When I fast, I drink water and black coffee. That’s it. Because I was embarking on something more ambitious this time, I had a cup of bone broth halfway through (on the fourth evening) which Dr. Fung recommends as a possible alternatively to the water-only regime, but Dr. Seyfriend does not. He doesn’t even recommend coffee or mineral water, actually. His anti-cancer 7-10 fast is on distilled water only, but that was a little more severe than I was up for.
Here’s a quote on hunger from Dr. Fung’s book written by a reader of keto advocate Jason Moore’s blog. I found it very compelling, profound, even, and I think it answer the “needs must” issue very cleanly. In short, needs never must.
“The way you experience yourself physically when you are fasting is practically identical to the way you experience yourself physically when you are eating. The reason this is so important is that when you think you experience hunger while eating normally, that same experience of hunger is present when you are fasting. In other words, the hunger sensations in fasting are the same as while eating normally. You then have to ask yourself how you can be hungry when you have eaten three hours ago when it is the same hunger sensation when you have not eaten anything at all for a week. What we think is hunger is not really hunger. That impulse to eat cannot be taken seriously.”