( ( A Calorie ) ( ( is ( ( a measure ) ( of ( ( the amount ) ( of ( energy ( found ( in ( a ( specific food ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NNP Calorie)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN energy)) (VP (VBN found) (PP (IN in) (NP (DT a) (JJ specific) (NN food)))))))))) (. .)))
A Calorie is a measure of the amount of energy found in a specific food.
(ROOT (S (NP (DT A) (NN calorie)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB express) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN energy)))) (PP (IN in) (NP (NN food)))))))) (. .)))
A calorie is used to express the amount of energy in food.