You should not drink more than four cups of coffee a day. The timing of its use is also important: Using it too early can increase stress and disrupt sleep later. This was reported by daily mail.
Most doctors recommend consuming no more than 400 milligrams (about four cups) of caffeine per day. People usually begin to feel more alert about five minutes after drinking coffee. The effects peak within 15 minutes to two hours, depending on whether the person has eaten and how quickly the caffeine is processed. It varies between people with different genetic variants: It can take up to ten hours for the body to completely eliminate caffeine.
The speed at which caffeine is processed determines how it affects a person’s sleep. Studies have shown that consuming too much caffeine or too late can reduce sleep by 30 minutes in people who process caffeine normally and by as much as an hour in people who take longer to clear caffeine. Additionally, a 2017 meta-analysis found that drinking coffee in the evening disrupts slow-wave sleep, a critical stage of sleep, and its deficiency is associated with a number of health problems, including heart disease, kidney disease, high blood pressure and diabetes. For this reason, most doctors recommend stopping coffee six to eight hours before bedtime or earlier.
However, to get maximum energy and avoid tension, avoid drinking coffee too early, before 9:30-11am. Research conducted in 2009 shows that levels of the stress hormone cortisol are highest in the morning. His concentration decreases sharply, first at 9:30 in the morning and then at 13:00 in the afternoon.
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