Imperian has hundreds of help files to help you learn more about the game and how to play.
After you have graduated from Imperian's novice introduction, you will gradually start growing hungry. Typing STATUS will show you how hungry you are. If you allow yourself to get too hungry, you can get sick, and eventually pass out. In order to eat, you will need to find yourself a shop that sells food. Generally speaking, the more expensive the food, the more sustenance value it has, though there is not an exact one-to-one correspondence. How hungry are you? The following is a brief review of the messages you'll see when you type STAT, and what they mean: weak from hunger - very hungry, you could eventually die feeling a bit peckish - hungry, no risk yet, but eat soon not hungry - eating would help a little, but isn't necessary reasonably full - eating probably won't help much utterly satiated - eating another bite would be superfluous