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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There are…so many wrong answers here. With so many science types that pursue this subreddit, I am shocked.
Anyway, caffeine does a lot of what you read here, but the one that mentioned competitive binding of adenosine receptors was the most correct in terms of wakefulness. In purely ELI5 terms, it keeps a switch on that lack of ATP (intracellular batteries) would usually cause to flip off or at least make harder to actuate (thresholds) giving the sense of energy that is not chemically supported.
It also has an effect on the heart, smooth muscle, and skeletal muscles. Again, in simplest terms, causes your muscle lining in your trachea (breathing tube head – lungs) to relax, stimulated your heart, and constricts your blood vessels. Will this make you feel more energetic? Probs not. But as a caffiholic, when I overdo the coffee and diet Mountain Dew, I definitely feel my heart, lol.
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