Consuming caffeinated or sugary drinks can affect the body's metabolism, causing changes in heart and respiratory rate and weight gain. The results of a new study exploring whether individuals respond differently to caffeinated drinks that do or do not contain sugar and to sugar alone are published in Journal of Caffeine Research: The International Multidisciplinary Journal of Caffeine Science, a peer-reviewed publication from Mary Ann Liebert, Inc., publishers. The article is available free on the Journal of Caffeine Research website until January 16, 2015.