Because coffee contains a stimulant called Caffeine which is the most commonly used Psychoactive drug. Coffee beans contain this stimulant in a considerable amount. Drinks containing caffeine are included to reduce drowsiness and increase performance. Caffeine also stimulates the autonomic nervous system. So it is always advised to take only 2 cups of coffee per day. To know about the best coffee maker follow this link.
Coffee contains Caffeine which is the central system stimulant, this caffeine content in the brewed coffee helps us to feel better and energetic instantly. The average caffeine content of an 8 Oz coffee is 95 mg. Caffeine is added on the several energy drinks and the cool drinks available in the market in the acceptable amount, at the same time the government has not make any legal and regulatory procedures of the unhealthy methods of usage of caffeine in the food products and drinks. Having more than two cups of coffee are not advised, and you can check the amount of caffeine in each coffee products on the Nutritional info of the product package. You can check the Nescafe Alegria website and get more information on the Nutritional info of the Nescafe coffee products and the coffee machines.