( ( When ( referring ( to ( ( the ( energy content ) ) ( of food ) ) ) ) ) ( , ( ( the ( actual calories ) ) ( ( ( ( are ( kilocalories ( -LRB- ( ( 1000 calories ) -RRB- ) ) ) ) and ) ( should ( be ( written ( with ( a ( capital ( `` ( C '' ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (VP (VBG referring) (PP (TO to) (NP (NP (DT the) (NN energy) (NN content)) (PP (IN of) (NP (NN food)))))))) (, ,) (NP (DT the) (JJ actual) (NNS calories)) (VP (VP (VBP are) (NP (NP (NNS kilocalories)) (PRN (-LRB- -LRB-) (NP (CD 1000) (NNS calories)) (-RRB- -RRB-)))) (CC and) (VP (MD should) (VP (VB be) (VP (VBN written) (PP (IN with) (NP (DT a) (NN capital) (`` ``) (NNP C) ('' ''))))))) (. .)))
When referring to the energy content of food, the actual calories are kilocalories (1000 calories) and should be written with a capital &quot;C&quot;.
(ROOT (S (NP (NP (DT The) (NN energy) (NN content)) (PP (IN of) (NP (NNS foods)))) (VP (VBZ is) (ADVP (RB often)) (VP (VBN expressed) (PP (IN in) (NP (NNS calories))))) (. .)))
The energy content of foods is often expressed in calories.