Scarcity brain evolved in a world where food was often in short supply. So it’s built to crave all foods, but especially foods that are packed with calories. The more rich and calorie dense a food, the more delicious it is. The more delicious it is, the more likely we are to crave it and, in turn, eat a little more than we need. Our body stores that extra food as fat. In the past, having extra fat was an insurance policy against starvation. Our bodies would draw on that fat to survive food scarcity. For energy when we couldn’t find food.