It depends on your gender and current weight. To maintain body weight, women will need to eat between 1,600 and 2,400 calories per day, whereas men require 2,000 to 3,000 calories per day. Reducing your daily calorie consumption by 25% can result in weight loss, and while the best survival food is designed to give you what you need, there’s a little trick that comes into play when you don’t consume the recommended daily number of calories.\r