what is energy? What makes us awake and energetic during the day?
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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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