Try to stick to black tea/coffee. Black tea or coffee can actually be good for you. But personally I would like to recommend tea rather than coffee. The caffeine in the coffee is not really good for you because it is an alkaloid and can affect other functions of your body like the metabolism.
Count the calories as you eat. It’s a good idea to have an idea of the calories that most food items have. If it is a packed thing then the label is sure to have the calories that the substance has.