Adenosine receptors are found on the outer surface of many cells in the body and they react to variable levels of adenosine near the cell to send a command inside the cell to lower its level of activity. This promotes sleep in the heart, kidneys, immune system and other tissues. Coffee but not tea – has consistently been found to protect against depression, and there’s also evidence that adenosine’s antagonists, including caffeine, that block adenosine receptors, are beneficial for the ageing brain. Do think that is harmful to our health for people with chronic diseases since it adenosine’s functions ?

