No, rabbit doesn’t have negative calories (neither does celery), it just doesn’t provide the fats, carbs or vitamins A and C your brain and cell membranes need to survive. And because it contains few calories per bunny, to eat enough bunnies to not die of a lack of calories, you may possibly risk overloading your liver trying to break down all that protein. A week on only rabbit leads to diarrhea as your body tries to rid itself of the excess ammonia and urea from the protein breakdown. The diarrhea quickly leads to dehydration, and it’s the electrolyte imbalance from the dehydration that really kills you.
You won’t starve eating rabbit. Plenty of people eat rabbit. You’ll die of dehydration or malnutrition if you eat ONLY rabbit for a week or more *and *you’re expending calories hiking and hunting those rabbits in a cold climate.