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The passage of a substance through some surface of the body into body fluids and tissues; Thus, small intestine absorption is where the most important absorption of products of digestion occur.  In literature, a RMR measure taken in a post-absorptive state typically describes when a person has fasted overnight or for a recommended period after eating.  This measurement represents a state with minimal heightened metabolic activity due to prior physical, mental or stress-related activities.


An individual going without food; Energy requirements of body metabolism during fasting are supplied by the oxidization of fats which, if glucose is not supplied, results in the products of incomplete fat combustion such as fatty acids, diacetic acid, and acetone.  This typically describes individuals who haven’t eaten for >/= 8 hours).


A prefix term meaning behind or after


A period from >6 hours after eating and < 8hours of fasting


A period occurring after eating a meal; see Subquestion #1 i, diet-induced thermogenesis, for additional information..

Postcibal (see postprandial)

A PubMed term used to describe time occurring after meals (i.e., cibum = food)

Specific Methods