( ( If ( ( the body ) ( ( does not ) ( absorb it ) ) ) ) ( , ( protein ( ( can ( be ( ( converted ( into energy ) ) ( at ( ( the rate ) ( of ( ( four calories ) ( per ( gram ( of protein ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN body)) (VP (VBZ does) (RB not) (VP (VB absorb) (NP (PRP it)))))) (, ,) (NP (NN protein)) (VP (MD can) (VP (VB be) (VP (VBN converted) (PP (IN into) (NP (NN energy))) (PP (IN at) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NP (CD four) (NNS calories)) (PP (IN per) (NP (NP (NN gram)) (PP (IN of) (NP (NN protein)))))))))))) (. .)))
If the body does not absorb it, protein can be converted into energy at the rate of four calories per gram of protein.
(ROOT (S (NP (NP (CD One) (NN gram)) (PP (IN of) (NP (NNS proteins)))) (VP (VBZ provides) (NP (NP (CD four) (NNS calories)) (PP (IN of) (NP (NN energy))))) (. .)))