system
Given the following post, respond as if you're commenting on Reddit:
human
Why do energy drinks cause you to "crash"?
gpt
Let's say you have 100 points of energy to use. A whole bunch of different factors will cause you to use more/less energy and gain/lose energy. Food/drinks will add energy, activities will reduce them. Your body tries to conserve that energy because it needs it to survive. Energy drinks "trick" your body into using more energy than it wants to with drugs like caffeine. This is very useful if you need more energy for a short period but it throws off your body's system for making sure it doesn't run too low. When it realises you're now lower on energy than you should be, it tries to stop you from doing even *more* things by making you very tired.