After water, Tea is the most widely consumed drink in the world. The addition of milk to tea in Europe was first mentioned in 1680 by the epistolist Madame de Sévigné. Many teas are traditionally drunk with milk in cultures where dairy products are consumed. These include Indian masala chai and British tea blends. Milk is thought to neutralise remaining tannins and reduce acidity.
The order of steps in preparing a cup of tea is a much-debated topic, and can vary widely between cultures or even individuals. Tea has many active ingredients that affect our health. It is particularly rich in antioxidants and vitamins. It is found to improve our immune system, to control blood sugar levels, reduce damage to cells and prevent cardiovascular diseases. If you consume a moderate amount of milk tea, it can not harm you.
But there is also a another side of the story, in 2007 study published in the European Heart Journal found certain beneficial effects of tea may be lost through the addition of milk. If you add milk to your tea, its beneficial effects on your vascular system go away and can hinder the absorption of essential nutrients in your body. It can affect badly if you consume it excessively. As milk and caffeine promote gas formation, thus adding milk to it can cause bloating and extremely bad for the hydration of the body. It also promotes anxiety, stress, restlessness, lack of sleep etc. According to MedlinePlus, a cup of tea can often have between 14 and 60 milligrams of caffeine, which is less than the caffeine found in coffee but it affects people differently when consumed in excess.