A character who is Hungry has missed one or more meals. You can have this condition multiple times, and instances of Hungry stack.

While you are Hungry, you suffer a -1 penalty to all skill checks. In addition, any dice of healing you receive are reduced by one point per die.

When you have the opportunity to eat a day's meal, you remove one instance of the Hungry condition. However, you can only eat up to twice a day's allotment of food in a single day. A character who is Hungry 3 would need three full days of eating double rations in order to shed all three instances of Hungry.