Gazb your body needs some time to adapt to a low carb diet. What you are experiencing now are probably sugar cravings, which tend to be independent from your actual food intake (you might be mechanically full, but still crave sugar or starch). Your current appetite levels are probably being distorted by prior high carb intakes.
Sugar cravings will soon disappear and you will feel perfectly satiated with meat, fat and vegetables. just give yourself some time to allow your appetite to stabilize and you'll be fine.
In the meantime, if the cravings are too high, consider using some artificial sweeteners to help you in the transition. Good luck.