Nope. Your body will do a lot of different things with different inputs. You're only looking at half of the equation - the input. Look also at the output. I

Nope. Your body will do a lot of different things with different inputs. You're only looking at half of the equation - the input. Look also at the output. If you're eating a lot of fiber and water, such as with lettuce, your "output" will be higher (bathroom). With white bread, more of what goes in will stay in. That's an oversimplification, but it's just one example that calories are not all the same. And for a more interesting example, the studies of fasting have demonstrated that caloric reduction (not complete fasting) will result in more muscle loss as your body is eating its own muscle to operate. But with a few days of total fasting, no calories, you will burn fat to survive. People on a restricted calorie test will lose more weight than people consuming zero calories - at least for a few days.