What are some possible side effects of energy drinks?

Explanation:

caffeine overdose (which can lead to a number of symptoms, including palpitations, high blood pressure, nausea and vomiting, convulsions and, in some cases, even death)

type 2 diabetes – as high consumption of caffeine reduces insulin sensitivity

late miscarriages, low birthweight and stillbirths in pregnant women

neurological and cardiovascular system effects in children and adolescents

sensation-seeking behaviour

use and dependence on other harmful substances

poor dental health

somewhat ironically, given their association with sportiness, obesity

Energy drinks contain substances that provide energy, of course, so they're bound to have side effects; especially if they're overdosed. Some of these side effects may include high anxiety, insomnia, dependence on energy drinks or alcohol, possible caffeine addiction, high blood pressure, and liver problems.