You burn calories differently depending on what you eat. This means 100 calories of crap burn at a different rate than 100 calories of the good stuff. Yes, burning 100 calories is 100 calories burnt regardless of the food source, but metabolism works 24-hours a day. Your body cannot adequately operate on a McDiet, so those calories would mess up your system, including your metabolism. This is why it isn't as simple as energy in vs. energy out.
You'd have a really hard time burning through 2,500 daily calories of McFood vs. burning through 2,500 calories of WillravelFood.
Metabolism is a complex mechanism.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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