Webif you’re a coffee drinker, missing your daily hit of caffeine can cause you to crave coffee. Why do people crave coffee? In some ways, people drink coffee because. Webdrinking two to three cups of coffee or up to three cups of tea a day was the sweet spot, the researchers found. People who consumed about 200 to 300 milligrams. A morning cup of coffee may do more than just perk you up, according to new research. Moderate amounts of caffeine intake — defined as one to three cups. Compared with nonconsumers or consumers of less.