According to dietitian Elena Solomatina, drinking strong tea in hot summer weather is fraught with sad consequences in the form of deterioration of health, the appearance of severe symptoms, and adverse changes in the work of the heart.The medic added that in the heat, drinking strong tea can cause “unfortunate consequences” in people who are highly sensitive to caffeine, as well as those who only occasionally drink coffee or tea. But even those who regularly consume these drinks can have an unexpectedly sharp response to caffeine if the complex effect on the body of a number of factors affects the body – heat, fatigue, lack of sleep, stress or excitement, overload.
“One cup strong tea can cause tachycardia, increased blood pressure, nausea and other unpleasant conditions,” Solomatina warned.
At that time, the specialist added, with good caffeine tolerance, tea helps to concentrate and improves performance.
Earlier portal MedikForum.ru wrote about why doctors call green peas a product that can slow down aging. 
Elena Solomatina healthy lifestyle nutritionist