Calories are pretty much meaningless. The kind of food, proportions of carbohydrates, and other components is very critical. Nutrition =/= filling gas in a car.
There are calorie dense foods that are nutrition poor foods, and vice versa. In living things, it's not about energy only, the contents that help keep the body processing and regulating matter by a lot.
The quality of calories matters a lot too.
I think you'll have to expand on what you're trying to say here as taking it at face value is clearly untrue.