Why do your cells care so much about carbohydrates, fats and proteins?
Your body is basically running a nonstop chemistry app in the background. Every second, your cells are carrying out huge numbers of reactions so you can release energy from food, build new materials, remove harmful substances, copy your DNA, and send messages around your body.
When atoms rearrange during one of these changes, old links between atoms are pulled apart and new ones are made.
A chemical bond is the attraction that keeps atoms joined inside a molecule.
Pulling bonds apart takes in energy, but making new bonds gives energy back out.
That matters for the three big food molecules you meet all the time: carbohydrates, fats, and proteins. Your cells break some of them down to get usable energy or smaller building blocks, and they also build some of them up again when your body needs storage, growth, or repair.
When you talk about metabolism, you mean the full set of chemical reactions in your body, including both building molecules and taking them apart.
If you eat more glucose than you need right away, your body does not just leave it floating around forever. It can turn that extra glucose into fatty acids, join those to glycerol, and make triglycerides so the energy is stored for later.
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