Another study concluded Monster and Rock Star energy drinks and others may affect the way the heart beats, causing more forceful contractions. The study, using MRIs, found people who consumed energy drinks had significantly increased heart contraction rates, causing more strain on the left ventricle, the portion of the heart involved in pumping blood from the lungs to the aorta and distributing it to the rest of the body.

The FDA is currently investigating health concerns surrounding the drinks after numerous adverse event reports have been submitted in recent years connecting energy drinks to severe injuries and deaths. According to information released in 2017, at least 37 adverse event reports have been received by the FDA involving health problems from Monster Energy drinks, including at least six deaths.

Amid aggressive marketing by the manufacturers, energy drink sales increased 240% between 2004 and 2009, and the number of caffeine overdose emergency room visits increased from 1,128 in 2005 to 16,055 in 2008. Approximately 56% of those visits involved individuals between the ages of 12 and 25 years.

最新研究成果表明，市面上流行的能量饮料会给孩子的身体健康带来极大风险。饮用诸如怪兽（Monster）、红牛（Red Bull）、摇滚明星（Rock Star）之类的能量饮料可能会引起癫痫、心脏病以及其他致命的疾病。

2010年10月到2013年9月，多家美国中毒控制中心（Poison Control Centers）接到投诉能量饮料安全问题的电话共5000多个。其中反映年龄不到6岁的孩童误喝“怪兽”等能量饮料的来电比例超过40%。

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