( ( ( A ( 100 calorie ) ) ( serving ( of grapes ) ) ) ( , ( ( ( ( ( a ( low-energy density ) ) , ) ( high-water ( content food ) ) ) , ) ( ( contains ( one ( and ( two ( thirds cups ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (DT A) (CD 100) (NN calorie)) (VP (VBG serving) (PP (IN of) (NP (NNS grapes))))) (, ,) (NP (NP (DT a) (JJ low-energy) (NN density)) (, ,) (NP (JJ high-water) (NN content) (NN food)) (, ,)) (VP (VBZ contains) (NP (CD one) (CC and) (CD two) (NNS thirds) (NNS cups))) (. .)))
A 100 calorie serving of grapes, a low-energy density, high-water content food, contains one and two thirds cups.
(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.