Sentence:  The physiology of <WSD>hanger</WSD>. The carbohydrates, proteins and fats in everything you eat are digested into simple sugars (such as glucose), amino acids and free fatty acids. These nutrients pass into your bloodstream from where they are distributed to your organs and tissues and used for energy ... 
Meaning of the word marked with <WSD> tags:  Hunger and anger, especially when the anger is induced by the hunger.