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(ROOT (S (PP (IN At) (NP (CD one) (NN time))) (, ,) (NP (NNS scientists)) (VP (VBD thought) (SBAR (S (NP (NP (PDT all) (DT the) (NN body)) (VP (VBN needed) (S (VP (TO to) (VP (VB function) (ADVP (RB properly))))))) (VP (VBD were) (NP (DT the) (NNS carbohydrates) (, ,) (NN fat) (, ,) (NN protein) (, ,) (NNS minerals) (, ,) (NN vitamins) (CC and) (NN water)) (PP (IN in) (NP (NN food))))))) (. .)))
At one time, scientists thought all the body needed to function properly were the carbohydrates, fat, protein, minerals, vitamins and water in food.
(ROOT (S (S (NP (NNS Vitamins)) (VP (VBP are) (NP (NP (DT the) (JJ organic) (NNS compounds)) (SBAR (IN that) (S (NP (DT the) (NN body)) (VP (VBZ needs) (PP (IN in) (NP (JJ small) (NNS amounts))) (S (VP (TO to) (VP (VB function) (ADVP (RB properly))))))))))) (: ;) (S (NP (NNS humans)) (VP (VBP need) (NP (CD 13) (JJ different) (NNS ones)))) (. .)))