Many people drink coffee in the morning is because it contains caffeine and makes them stay awake. The average cup of coffee contains about 85-100mg of caffeine and only after 15-30 minutes of drinking your coffee, the nervous system becomes stimulated and will stay stimulated for about six hours. The Food and Drug Administration says that the average American adult consumes about 300mg of caffeine each day. Having you morning coffee can also boast your health and help you live longer. Many studies show that people who increased their coffee consumption daily over four years had a 11% lower risk for type 2 diabetes than those who did not increase their coffee intake. Other studies show that men who drink more coffee or other caffeinated drinks are less likely to develop Parkinson’s disease.The World Cancer Research Fund, shows that regular consumption of coffee does not increase the risk for cancer. It may lower the risk for some types of cancer (colon and liver). Just remember only drink coffee in moderation (three cups a day)! The source I used: