I went through an adjustment period, too, each time lasting three days. It was never as bad as the "Keto Flu" from doing Atkins, but definitely felt a little off. By day 3, it's passed every time, and I end up feeling amazing. Lighter, more energy, less aches and pains, better mood. I noticed the gum thing Otis was talking about, too. And my snoring gets better. Less inflammation in the body, in general. And, on top of that food cravings are gone. I can look at one of my favorite foods and just see it- with no attachment or wishing I could have it. Totally dispassionately just view it as a suboptimal fuel source, and not some forbidden fruit.
And the lack of hunger thing is pretty wild, but I just use it as a time to actually listen to my body and realize how programmed I go through the day. Now, I only eat if I'm hungry, not because it's a certain time of the day, or because it's been X amount of hours. I realized I've only very rarely ever been truly hungry in my whole life. Most times I've eaten, it was because I've wanted to eat. Never been in tune with my body enough to really stop and listen to what it's telling me. Now, I know what hunger feels like. It's a lot different than I thought.