It’s a commonly held belief that coffee and chai are dehydrating because of their caffeine content but that’s actually a myth, says New York City-based nutritionist Lisa Cashman. “While the caffeine in coffee and tea can be a diuretic, meaning these drinks cause fluid loss—the fluid in them typically makes up for it.” So your daily morning and evening chai habit is still better than sipping on nothing. Keep in mind though, tea and coffee have far less caffeine than fizzy cold drinks, so ditch cola and grab green tea instead.
courtesy of: http://tribune.com.pk/story/931596/5-ways-youre-hydrating-wrong/