Coffee is the second most consumed beverage in the world, behind water. There are many people consume it everyday. They consume coffee at least 1 or more cups of coffee per a day. In addition, coffee is not only popular among adults but teenagers also drink it. In fact, there are caffeine and sugar in coffee that has pros and cons which affects consumers’ health such as physical health or mental health: increasing heart rate, obesity, headaches, blood pressure, etc. So, customer should be aware of the danger of consuming too much coffee, especially teenagers should reduce the amount coffee in their diet.
From past to present coffee is a beverage that many people usually drink it along side breakfast, lunch or dinner. For example, Americans daily drink more than 400 million cups of coffee, which is the major source of caffeine in their diet, compared with tea and caffeinated soft drinks in children and teenagers. (Elsevier B.V., 2014) Moreover, coffee shops are available everywhere, such as Starbucks, McDonald’s, Dunkin Donuts, 7-eleven etc. Some shops have many services for attracting customer. Their service can greatly attract customers, especially teenagers because they can use the internet while they are working or playing social network. Some restaurants usually serve coffee at the end of meat. Coffee has become a fashionable beverage among teenagers. They usually take photos with their coffee cups and upload their picture on Instagram, Facebook, etc. Photography with a