what is energy? What makes us awake and energetic during the day?
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ATP (adenosine triphosphate) is what your body uses for energy. It is made in the mitochondria via the Krebs cycle. One of the phosphate particles detaches from the molecule when it expends energy. When energy is consumed and the spent molecules of adenosine diphosphate (ADP) build up, you start to become sleepy
There are two things going on here: we get actual physical energy (the stuff counted in kilocalories or Joules) from foods and drinks, but being “energetic” is more a matter of vitality. As an example, so-called energy drinks rely mostly on caffeine to invigorate you by stimulating your central nervous system, but don’t necessarily have that much actual energy. And while eating a big meal does deliver a lot of energy to your body, it can make you feel drowsy, as your digestion works on the food and controls your blood sugar levels.
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