hunger means your metabolism is burning sugar for energy, instead of fat. If you go carnivore, high fat diet, after 2 weeks or so your body starts using fat as fuel...I recently did a 2 day fast and even though my blood glucose was 75 on day 2, I didnt feel any hunger. If you get "hangry", or headaches if you miss a meal, that means your metabolism is burning sugar for fuel, instead of fat 97℅ of the population is a sugar based metabolism and a slave to 3 meals a day with snacks.