your metabolism has evolved to slow down when you are not consuming enough. That means that calorie calculations are rendered totally moot and pointless when you understand that your metabolism is adjusting itself to purposely keep on weight when it senses restriction. Your body is trying to conserve energy and also trying to get you to eat. So, restriction of any kind will cause you to fixate on food, be hungrier, more tired, and put on weight quicker—all to save your life. Those symptoms are often signs of a slow metabolism.
