THC--if you're on a ketonic diet and you're hungry--eat some protein or some fat. A tablespoon of peanut butter on low-carb crackers (Rykrisp, FinnCrisp, etc.) will work. Or can'o'tuna. The amount of protein depends on yor bodyweight, goals, etc. If you're not in ketosis, up your fat.
Freak--deep ketosis can cause insomnia. You might up your carbs a tiny, tiny bit. If your joints ache--fish oil caplets will help.