Individual differences influencing caffeine intake. Analysis of drinking behaviors at different times of the day and sources of caffeine The purpose of this study was to research different personalities and how they influence caffeine intake. Regular use was predicted by gender, age, nicotine use, and types of personality traits. Consistent caffeine consumption is known to impair sleep and increase anxiety, and if excessive consumption becomes chronic it could cause addiction and/or worsen psychological symptoms (Juliano et al., 2011, Ogawa and Ueki, 2007, Rihs et al., 1996). Caffeine can, however, cause positive effects in cognitive areas: it improves alertness, decreases fatigue, improves the performance of basic tasks that require concentration and continuous response, improves mood and reduces symptoms of depression. (Attwood et al., 2007, Glade, 2010 and Lara, 2010). Numerous studies suggest that general and specific personality traits reflect the amount of caffeine consumed daily. A seminal study (Landrum 1992) showed a positive correlation between caffeine consumption and extroversion. The same research (Adan, 1994) explored whether caffeine consumption could be influenced by an individual's circadian preference (a morning or evening preference). The data showed higher caffeine intake for those who were more active during the evening. (Ishihara et al., 1985, Mitchell and Redman, 1993, Shohet and Landrum, 2001 and Sánchez-Turet et al., 1992). Demographic variables, such as gender and age, and cigarette smoking behaviors have often been reported to correlate with caffeine intake. In both clinical samples, men generally consumed more caffeine than women (Ciapparelli et al., 2010, Lee et al., 1999......middle of paper......activities (skydiving, snowboarding etc.) .).Energy drinks have the potential to have a greater negative effect on children since their brains and bodies are still developing. Children who drink caffeine are more likely to develop unhealthy eating behaviors and become overweight College students have also become a cause for concern as an increasing number of students report adding alcohol to their energy drinks. This combination of alcohol with a caffeinated beverage is known to cause a greater increase in dangerous behaviors. There is heated debate about whether addiction from caffeine should be classified as a certified disorder. It is clear that there are still many unexplored aspects of caffeine and the human body and there are many research opportunities to come..