Perhaps your body just adjusted to using your own fat. Normally, if a dieter is losing appetite - I would think it is a sign of slowing metabolism. However, you say that you still have energy and are losing weight maybe it is ok for a few weeks. Things might be different for those on paleo. If it continues more than a week or so, you could try adding some sweet potato to your diet. As you noticed, carbs increase appetite.

If the lack of appetite continues long term - consider talking to your doctor about it - he might want to check your blood levels just to make sure everything else is ok.

Also, since you have a cheat day - you may be balancing out over the whole week - just a thought.

Do you weight train?

Do you work out very often? I find that I can get by on the paleo lifestyle by eating very few calories some days, but those are always the days I'm sedentary. If I exercise, I eat more calories.

I had to chuckle.

Here's all of us fatties *****ing about those thin-as-a-rail types who can eat anything they want but not get fat. You've managed to kickstart yourself into the 'zone' and you're worried? I should be so lucky.

Enjoy it - once you reach the size that your body feels is optimal, your appetite will increase and your weight loss will stop.

I think the weight training will increase your appetite. That's what exercise does. Makes your body want to eat more. But if your appetite doesn't increase I wouldn't worry about it.

If you have plenty of fat storage to dig into and your body has switched to fat-burning I believe you are good. Your body will let you know when it wants more.

I did have my metabolism slow down on me but that was because I was at a normal weight and bf% when I wasn't eating that much - just wasn't hungry during the day. My body fat dropped to around 18% before it happened. I think it was just my body saying "I don't like this. I want more fat for storage." I had hit 110.6 at the end of August. The metabolism slowing really kicked in the sugar cravings and I battled it for a couple more months (in November I ballooned up 10lbs in two weeks!!). Had to really increase my fat to get rid of the cravings (cans of coconut milk helped increase my calories and fat). I am now hovering around 19%-20% without trying (113-115lbs). I slacked off on the weight training and the once a week sprints so I haven't been doing a lot of exercise. It's really interesting to see the scale say the same thing days in a row.

Mark Sasson's newest Primal Blueprint book (maybe you have the newest book):

"Eyes glazing over yet? Just get this: your body makes energy internally. Regular meals are overrated!"

"You may find this scientifically interesting, but what are the real-life advantages of begin fat and keto-adapted? For one, you will no longer have an issue with storing excess body fat, and will easily arrive at and maintain your genetically ideal body composition. Second, you will experience less systemic inflammation, which is a disturbing by-product of being a sugar burner...Finally, your body will adapt to survive for the rest of your life on FEWER CALORIES - without an increase in your hunger or a decrease in your daily energy levels. You'll be less reliant and less hassled by the need to constantly find fuel to keep your brain and your engine running, and you will very likely extend your lifespan (and the quality of that lifespan), as this so-called "caloric efficiency" is strongly correlated with longevity in every living organism."