As cold weather creeps in, we all set our thermostats a little higher to keep warm. When we do, our bill goes up; or the cost of increasing the heat in the house and kicking our furnace in takes more money, or in other words, it takes more energy to keep things heated up.

Our bodies work in a similar fashion. When we can turn up the heat in our body it takes more energy, or “costs” more to make the system run at a higher level. This is metabolism. Another definition is that metabolism is the way that chemical processes in our bodies cause food to be used in an efficient way, for example to make new cells and to give us energy.

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