Other than psychotropic substances, alcohol and cigarettes, , Caffeine is also recognized as an addictive substance. Prolonged use of caffeine usually produces physical and psychological dependence by its stimulant effects on the central nervous system and skeletal muscles. Intoxication may develop with over-consumption of caffeine such as restlessness, nervousness, excitement, insomnia, flushed face, diuresis and gastrointestinal complaints. Discontinuation of caffeine use may result in withdrawal symptoms, including headaches, increased fatigue, and decreased vigor and so on. Caffeine can be consumed from a number of sources. For instance, coffee, tea, caffeinated soda, weight loss products, chocolate and so on. Some consumers are turning to the newest fad in the caffeine market – energy drinks. These beverages have high caffeine and sugar content, are infused with herbal additives, and marketed particularly to youth.