Energy drinks claim to provide energy but can have both positive and negative health effects. Positively, they contain ingredients like guarana and caffeine that can increase energy levels and mental alertness. However, they also have several negative short and long term effects. In the short term, they can increase heart rate, blood pressure, and prevent sleep. Long term, they are linked to cardiovascular issues like heart attacks and strokes due to elevated blood pressure over time. Prolonged consumption can also lead to addiction, insomnia, and risky behaviors when mixed with alcohol.