( ( In contrast ) ( , ( ( ( the ( worst fats ) ) ( for ( heart ( disease risk ) ) ) ) ( ( ( ( ( ( are saturated ) and ) ( trans ( unsaturated fats ) ) ) , ) ( say ( ( the ( study 's ) ) authors ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NN contrast))) (, ,) (NP (NP (DT the) (JJS worst) (NNS fats)) (PP (IN for) (NP (NN heart) (NN disease) (NN risk)))) (VP (VP (VBP are) (VP (VBN saturated))) (CC and) (VP (VBZ trans) (NP (JJ unsaturated) (NNS fats))) (, ,) (VP (VBP say) (NP (NP (DT the) (NN study) (POS 's)) (NNS authors)))) (. .)))
In contrast, the worst fats for heart disease risk are saturated and trans unsaturated fats, say the study's authors.
(ROOT (S (NP (NNP Trans) (NNS fats)) (VP (VBP have) (VP (VBN been) (VP (VBN implicated) (PP (IN in) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (NN heart) (NN disease)))))))) (. .)))