Hunger is one of the primary game concepts, as it is the measurement which determines whether or not the character is starving (which is, of course, the game's namesake). As a Character gets hungrier, the meter will empty, and the stomach pictured will shrivel.
A full stomach for most characters is measured at 150, except for Wolfgang (300), WX-78 (100-200), Wes (113), Wigfrid (120), Webber (175), Walani (200), Warly (250), and Wilbur (175). Hunger drains at 9.375 points per minute, (10.3125 as Walani; 11.719 as Wes; 12.46875 as Warly; from 9.375 to 28.125 as Wolfgang) or 75 points per game day (82.5 as Walani; 93.75 as Wes; 99.75 as Warly; from 75 to 225 as Wolfgang). Hunger drain can also be slowed to 60% of its normal rate by equipping a Belt of Hunger, and slowed to 75% normal rate by wearing the Hibearnation Vest.
When the Hunger meter is emptied, Health will begin to drain at 1.25 points per second until something is eaten or the character dies. Most food will restore the Hunger meter when eaten. The amount restored depends on the food eaten; cooked food typically restores more than raw food. Some food also has the potential to decrease Hunger, Sanity, or Health. Also, when going to sleep in a Straw Roll, Fur Roll or a Tent, the character takes an immediate hunger penalty.