On almost everything processed that you eat there will be something called "NUTRITION FACTS" on the back. Have you ever taken a look at the first thing listed?
This is a Calorie. A calorie is a unit of measurement of energy (the same energy talked about previously). On these labels though, the Calories talked about are actually kilocalories. You can calculate your energy intake by adding up these values.
There is actually a very precise way to calculate your energy output. Your body naturally uses up a ton of energy just living (digestion, respiration, etc.). Scientist have calculated this number generally according body type activity level. The more in shape you are, the more energy is used up naturally.
I could give you a formula to calculate your exact energy input and output, but it can get pretty complicated, and I DON'T BELIEVE IN CALORIE COUNTING. I'm more interested in the psychology of these things...
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