Another study investigated the connection between consumption of these drinks and probability of stroke. It was found out that that drinking 4 (960 ml) or more cups of black tea per day reduced the risk of stroke by 21%, while drinking 5 cups (1.2 L) of coffee a day reduced the risk of stroke by 23% comparing to the people who don’t drink coffee at all. However, it is worth to mention that such doses are not recommended for kids, pregnant women, people who have heart diseases, severe atherosclerosis, kidney disease, insomnia, and others. So it is important to consider health features because coffee may harm your body as well.
Nervous system and mental health
People who drink three cups of tea a day are 37% less likely to develop depression than those who do not drink it at all. Theobromine and theophylline in the composition of tea tone up the nervous system and help to relieve stress. In addition, L-theanine reduces the level of the "raging" hormone - cortisol. To increase stress resistance to stressful situations, it is recommended to drink green tea for 6 weeks. This is one of the best ways to cope with insomnia and anxiety. Сonsuming L-theanine along with caffeine – like in tea – can help you to be focused and increase concentration.
A recent analysis found that every cup of coffee drunk during the day reduces the risk of developing depression by nearly 8%. Coffee contains significant amounts of B vitamins, which help with nervous system health, and thus can improve how you feel during your day. Apart from tea, higher caffeine content will allow you to quickly cheer up and be more energetic. However, tea appears to provide a more sustained boost in energy than coffee because L-theanine contained in it metabolizes caffeine over a longer period of time.