Try this: don't eat anything for a few days and try going for a run. You think your body wouldn't force you to stay on the couch? Conversely, stuff your face all day with natural, whole foods. Then try sitting on the couch all night watching TV. You'll feel like you have a hyperkinetic disorder.
The part about not eating anything I agree with. But, to say that just because you have an energy surplus, you will instinctively find a way to burn it off? Umm, no...
The better question is: How does the amount of calories you eat affect the amount of energy your body has available to operate on a daily basis?
More calories = more energy. More energy does not automatically mean you will instinctively find a way burn it off....
No, not at all. You eat more food than normal, create an energy surplus, but then you move more (instinctively) to burn it off. It's not a matter of will, it's natural instinct.
But wait, eating a ton of junk food will still create a huge energy surplus. You then move more instinctively to burn it off? No, I think most people would tend to agree that is false....
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A few things...
1st - This really has very little to do with the calories in vs calories out argument. The problem is that so many people try to layer so many things on top of the argument that the original point gets lost. I am talking about nutrient metabolism, you are going into natural instinct and other things that have nothing to do with the original argument.
2nd - So many people overestimate the amount of calories extra activity will burn. For the average sized man, it will take you 1 hour of brisk walking to burn off the calories consumed from 2 apples, or 2 tbsp of olive oil, of other small amounts of healthy food. To think that even over the long, long term, this will all somehow even out due to natural human instinct is absurd.
You know what every successful diet does? It creates a caloric deficit. Low Carb, High Carb, Low Carb, High Carb, etc - they are all designed in different ways and focus on different macronutrient groups, but if they cause you to lose weight, it is through a caloric deficit. It is just that simple...
At the end of the day, though, this is starting to veer off in a totally different direction than what the OP is about...
The only reason I am still here is because I can't sleep due to a prolonged case of food poisoning...from bean sprouts - healthy food my a**...