Why is tea dehyrdating
It is true that caffeinated fluids can contribute to your daily fluid requirement.
Drinking caffeine–containing beverages as part of a normal lifestyle doesn't cause fluid loss in excess of the volume ingested.
They controlled the diets of 59 healthy males for 11 days, supplementing their daily consumption with body-mass-appropriate doses of caffeine, administered twice a day via capsule.
But science says it's a bit more complicated than that.
Caffeine — found in coffee, tea, soda and even chocolate — is the most widely consumed psychoactive substance on the planet.
Used predominantly as a means to perk people up, the stimulant is legal and unregulated in most parts of the world.
However, it's commonly thought that caffeine is responsible for some undesirable side effects, including dehydration.
The idea that caffeine can cause dehydration can be traced to a study performed in 1928 that noted increased urination in people who drank caffeinated beverages, and suggested that caffeine was a diuretic, according to Lawrence Armstrong, a professor in the Department of Kinesiology at the University of Connecticut and director of the Human Performance Laboratory.