The most common sources of caffeine for human consumption are the tea leaves of the Camellia sinensis plant and the coffee bean, the seed of the Coffea plant. Some people drink beverages containing caffeine to relieve or prevent drowsiness and to improve cognitive performance. If you have problems with your PC locking or going to sleep, caffeine will keep it awake.

Understanding the Context

It works by simulating a keypress once every 59 seconds, so your machine thinks you're still working at the keyboard, so won't lock the screen or activate the screensaver. Up to 400 milligrams (mg) of caffeine a day seems safe for most adults. That's about the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks. Keep in mind that the caffeine content in drinks varies widely.

Key Insights

What is caffeine? Caffeine is a type of drug called a stimulant, meaning it increases chemicals in your brain called neurotransmitters. Caffeine is a natural stimulant consumed throughout the world. This article reviews caffeine and its health effects, both good and bad. Learn how caffeine affects brain chemicals and health, sleep, and mood.

Final Thoughts

Understand safe daily limits, hidden sources, and signs youโ€™re getting too much. Caffeine is a drug that stimulates (increases the activity of) your brain and nervous system. Caffeine is found in many drinks such as coffee, tea, soft drinks and energy drinks. Chocolate also contains caffeine. Energy drinks often have more caffeine and sugar than soft drinks. Caffeine can interfere with your ability to recognize how drunk you are, which can lead you to drink more.

This also makes you more likely to make bad decisions.