( ( back ( to ( top calorie ) ) ) ( Calories ( ( are ( used ( to ( ( measure ( both ( the ( energy potential ) ) ) ) ( in ( ( foods and ) ( ( the amount ) ( of ( energy ( ( used ( by ( the body ) ) ) ( to ( burn ( those foods ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB back) (PP (TO to) (NP (JJ top) (NN calorie)))) (NP (NNP Calories)) (VP (VBP are) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (PDT both) (DT the) (NN energy) (NN potential)) (PP (IN in) (NP (NP (NNS foods)) (CC and) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN energy)) (VP (VBN used) (PP (IN by) (NP (DT the) (NN body))) (S (VP (TO to) (VP (VB burn) (NP (DT those) (NNS foods)))))))))))))))) (. .)))
back to top calorie Calories are used to measure both the energy potential in foods and the amount of energy used by the body to burn those foods.
(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.