There is no single meal or drink that will make or break your long-term health. Caffeinated coffee should not be consumed by people who have arrhythmias (such as an irregular heartbeat). People who are frequently worried or anxious may want to avoid caffeine because it can increase these feelings. However, studies show that caffeine can cause problems for people with anxiety disorders or panic attacks. In fact, researchers think this may be one reason why people with anxiety disorders are more likely to experience symptoms when they go through withdrawal. Caffeine can be found in many popular drinks and foods. It can be added to tea, coffee, sodas, energy drinks, chocolate, cookies, and even some medications. Because of this, it is very difficult to say exactly how much caffeine you are consuming on a daily basis. But most adults consume between 200 mg and 400 mg per day, while children consume less than this amount. Too much caffeine can be harmful. Adults who consume more than 600 mg per day may develop short-term effects such as nervousness, irritability, and insomnia. Long-term exposure to high levels of caffeine may lead to depression, anxiety, fatigue, difficulty sleeping, heartburn, and diarrhea. For infants and young children, any amount of caffeine can be harmful.