High blood pressure, cancer and other types of people avoid drinking coffee.

Some people rely on high concentrations of coffee to stimulate the brain for a long time, which is not necessarily good. According to research, after drinking high concentration of coffee, the adrenal gland accumulates in the body, resulting in faster heartbeat, higher blood pressure, nervousness, tinnitus and involuntary foot tremor. Therefore, the concentration of coffee must not be too high. Caffeine in healthy adults every day