Energy drinks themselves do not cause cancer. When "cancer causing" diet habits came up, the article refers to sugary drinks which includes soda, energy, fruity, or sports drinks. The reported study included 95,000 adult women, 109 of which developed colon cancer before turning 50. The risk was highest for women who reported drinking sugary drinks as teenagers. According to the UT Medical Center, there is no scientific link between energy drinks and cancer. But, doctors advise against consuming too much caffeine and sugar regularly, both of which are main ingredients in energy drinks. Of course, having anything high in sugar without moderation can contribute to poorer health down the road, but no, energy drinks do not cause cancer. The excessive consumption of sugar throughout your life puts you at a higher risk for health complications and disease.