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Ok, I'm not very good at the science behind this stuff but I'll try to explain it haha.
Calories is the measure of how much energy food has. A caloric deficit means the food you are eating does not provide as much energy as your body needs. If your body needs more energy than your food provides than it will start breaking down your fat and getting energy from there (and even muscle in some cases). It gets a lot more complicated than that, but I think for our purposes we don't need to go much deeper than that.
Google a diet called Carb Nite. It's a good diet for people with a bit higher amount of bodyfat to lose. If you look hard enough you can find a pdf of it floating around somewhere.
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