Mechanisms	Causes
Altered ability to process nutrients	Impaired glucose, lipid, and protein metabolism
Increased energy requirements	Tumor consumption of and competition for nutrients
	Hypermetabolic state due to tumor growth
	Infection/fever
	Dyspnea
Decreased intake of energy sources	Anorexia
	Nausea/vomiting
	Diarrhea
	Bowel obstruction