Nope! Drinking matcha is perfectly healthy for you. How much you drink depends on your caffeine tolerance. A cup of matcha can have as much caffeine as 2/3 a cup of coffee. Most people tend to drink 1 to 3 cups of matcha a day (1/2 tsp per serving), and they avoid drinking it in the evening. Too much of anything, even water, isn’t good for your body, so don’t chug any liquid 24 hours a day non stop.