( ( ( Choose foods ) ( with ( a ( high ( calorie content ) ) ) ) ) . )
(ROOT (S (VP (VB Choose) (NP (NNS foods)) (PP (IN with) (NP (DT a) (JJ high) (NN calorie) (NN content)))) (. .)))
Choose foods with a high calorie content.
(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.