Question

The specific dynamic action of food 

A. Is the increase in metabolic rate that results from ingestion of food. 

B. Persists for about an hour after a meal is ingested. 

C. Is due to the additional energy expended in digesting and absorbing the food. 

D. Results in about 30 per cent of the energy value of ingested protein being unavailable for other purposes.

E. Results in about 20 per cent of the energy value of ingested fat and carbohydrate being unavailable for other purposes.

Answer 1

A. True This is its definition. 

B. False It persists for about six hours. 

C. False It is due mainly to the additional energy expended on processing absorbed material for detoxification, metabolism and storage. 

D. True Mainly because of the energy required to deaminate amino acids. 

E. False The figures are around 4 per cent for fat and 6 per cent for carbohydrate.