By Angela Betsaida B. Laguipo, BSNReviewed by Dr. Liji Thomas, MD Energy drinks are beverages that contain concentrated amounts of caffeine and other stimulants, including sugar, sweeteners, herbal supplements, vitamins, and taurine. Energy drinks are marketed to improve energy, stamina, concentration, athletic performance, and even weight loss. But, there are limited studies to prove these claims. In fact, many side...