That's the best part -- you won't become a blowfish! Don't worry about the calories, just the carbs.
Also, if you feel very hungry, knock yourself out! Eat until you're full. If you still feel hungry, it's possible you're going through carbohydrate withdrawal (if you're in the first two to four days of the diet). It happened to me. If you get through withdrawal, then you'll go into ketosis, and you'll start losing those unwanted pounds!