Does caffeine make us have more energy even though it doesn’t have many calories? Does it make our bodies use up fat that is already stored? Where does the extra energy from caffeine come from?
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“Energy” in the sense of your desire to move around, focus on things, etc, and “energy” in the physics sense, are not the same thing, though they’re weakly related. You’re still consuming physics!energy while you’re sleeping, even though that’s your lowest psychological!energy state, for example.
Caffeine is a stimulant. That means it pushes the body away from restful behaviors and towards energetic ones, and shifts the body into a physical mode that prepares it to take on those energetic tasks (in medical terms, it increases *arousal* – this is a different, more general, usage from its use in sex). For example, it increases heart rate and blood pressure as part of supplying more oxygen to the body.
That means that caffeine gives you more psychological!energy. But running your body that way has trade-offs. One of them is that your body is *consuming* more physics!energy to run itself. In that sense, caffeine actually *costs* you energy, at least a little. (Another trade-off is that your body puts maintenance work on hold to support immediate activity.)
Caffeine just prevents you from being able to tell that you’re tired by blocking certain receptors in your brain, and gives you a shot of adrenaline.
Adrenaline has the effect of redirecting blood flow and increasing blood sugar levels, since it’s used to prepare you to fight or run from threats.
So, it doesn’t give you energy. It just makes you feel like you’re less tired, and puts your body in an excited state.
Caffeine does not directly provide us with energy, but it does make us more alert and able to stay awake for longer periods of time. Caffeine does not make our bodies use up fat that is already stored; instead it stimulates the central nervous system, which can make us feel more energized. The extra energy from caffeine comes from increased alertness and focus, as well as increased blood flow throughout the body. This can lead to improved physical performance and endurance.
Its because of how it interacts with receptors in the body. Caffeine conveniently slots in where the chemicals that would make you feel tired (Adenosine) slot in. Essentially just making it harder for you to feel that tiredness, i wish i could remember what the chemical was called though
Caffeine burn calories. It tells your brain that you are not tired. As a result you move more and that causes you to burn calories.