How does caffeine work? When the cells of the body lack energy, we feel tired. At this time, the substance adenosine is formed in the cells, its appearance is a signal of serious fatigue and depletion of energy reserves. Almost all cells in our body have adenosine receptors that inhibit intracellular processes. With fatigue and the appearance of adenosine, the heart muscle begins to work weaker, smooth muscles in the walls of internal organs, blood vessels relax. Caffeine
adenosine "fatigue receptors", so the feeling of fatigue weakens.
At the same time, coffee does not carry energy in itself, but only gives a sense of vigor, on which you can exist for a while.
Experts advise eating caffeinated products 45-90 minutes before the start of the workout. Caffeine is not only found in coffee. The effect of one milk chocolate or 0.5 liter of cola is equal to the effect of one cup of strong coffee.
Drinking too much caffeine (for each person the value is individual, but on average it is more than 300 mg, or two cups of coffee) can lead to insomnia, nervousness, anxiety, nausea, and headaches.