11/02/2023
Caffeine is a natural pesticide.
Caffeine—which is found in tea leaves, guarana berries, kola nuts, and, of course, coffee beans—acts as a natural pesticide.
It overloads the nervous systems of insects that try to eat the plants containing caffeine, paralyzing and even killing them before they can do too much damage. It affects humans' central nervous systems, too, but for us, it merely acts as a stimulant.