What are calories? Is it the amount if energy in a food? How does the body uses calories, burns calories, and how does excess calories becomes fat?
Why are food “low in calories” good for you? Why are food of the same size, have different amount if calories?
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A calorie is a measure of heat. Put some food in a metal box (a “bomb calorimeter”), set fire to it and put the box in some water. Measure how much hotter the water is.
Bodies use calories in the same way that cars use gas. You need 2000 kcalories a day even if you sleep 24 hours just to fuel your processes; if you work in an office you need more, and if you work in a warehouse you need even more.
You don’t pee or poop calories out; your body stores them as fat, so 1lb of fat is around 3500 kcalories.
So if you want to lose 1lb of fat and you burn 2500kcal a day, you can cut your intake down to 2000kcal per day and your body will take the other 500kcal from your fat. You will lose that pound in seven days (7×500=3500).
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