Energy and the maintenance of the body cell mass.
D000328:Adult; D000368:Aged; D000818:Animals; D001823:Body Composition; D002940:Circadian Rhythm; D002149:Energy Intake; D004734:Energy Metabolism; D005260:Female; D006801:Humans; D008297:Male; D008660:Metabolism; D009751:Nutritional Requirements; D010288:Parenteral Nutrition; D005082:Physical Exertion; D014176:Protein Biosynthesis; D012146:Rest