One remarkable ability of the human body is changing food into nutrients, allowing us to survive and thrive.
When we eat food, it ends up in our digestive system that is composed of several organs. The goal is to turn the food into nutrients.
Saliva and gastric acid contain enzymes that break the chyme down further with a process called chemical digestion, where our body further breaks everything we eat into small absorbable molecules.
The bolus keeps being pushed through the intestines and broken down by enzymes and other substances. Other organs also contribute to breaking the digested food into nutrients, which are then absorbed through the intestinal villi and sent to the bloodstream.
Glucose is the primary "fuel" that produce energy.
While fasting, the body consumes the glycogen first, then fats, then proteins.
Electricity can light your lamps or power your appliances. But electricity needs to be produced first. We need a fuel that can be converted into electricity, such as petroleum (carbohydrates) that is converted into gasoline (glucose). Or solar energy (fats) or wind power (proteins).
We store the petroleum in warehouses (adipose tissue) for later use. The energy produced by electricity is used to build new materials (amino acids) and used to construct bridges or houses (muscular tissue).
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