Currenlty, a study published in the European Heart Journal said that tea drinkers enjoy some protection against heart disease; however, the benefits are completely wiped out when milk is added. Milk apparently modifies the biological activities of tea ingredients. Green or black Tea is known to relax blood vessels, but adding milk to it may delay the process. milk makes tea acidic . Experts believe that caseins, which are the proteins found in milk form complexes with catechin in tea, which is its most important flavonoid. Catechin is basically responsible for stimulating the production of chemical nitric oxide which makes it acidic .
Since Im a milk tea lover maybe i would just lessen my milk tea drinking habits to prevent myself of being acidic.