Tea will have less caffeine than coffee. It also wins out in terms of health benefits. An eight-ounce cup of Dunkin Donuts coffee contains 104 milligrams of caffeine. Whereas an eight-ounce cup of tea only has about 25 milligrams of caffeine. Well, it depends on your tolerance level to caffeine.
Some people get heart palpitations after two cups, others can handle three.
2.5 cups of coffee per day, if you are talking about an eight-ounce cup is okay. Watch out if you are a mug user, they tend to be larger than the eight-ounce standard cup. The health benefits of tea may outweigh coffee, but as long as you monitor the caffeine you are fine in moderation. There's something about holding that cup in your hand in the morning, so if you need the dark stuff, the java is fine. Suspicions that coffee might be dangerous to our health began with a simple observation, later verified, of a condition called the coffee-withdrawal headache.