The definition of hunger is:
a) A craving or urgent need for food or a specific nutrient.
b) An uneasy sensation occasioned by the lack of food
c) A weakened condition brought about by prolonged lack of food
When you are hungry, and there is no food available, your body starts to feed on itself. It feeds on your own fat and body tissues. If you don’t eat for long period of time you will eventually lose about 50% of your body weight and your skin becomes thin, stiff and pale. You are always cold and your hair becomes dry and spars and eventually falls out. After about 8-12 weeks without food, you starve to death.
This an extreme version of hunger and most people in our country will never experience this, but people who are chronically hungry do experience undernourishment. The effects are lack of energy and are not able to think clearly. Children who are undernourished have a hard time studying and learning, they also may develop more slowly than other children. Unfortunately this also leads to weaken immune systems and chronic illness.