( ( Weight ( loss strategy ) ) ( ( needs ( to ( be ( focused ( on ( how ( to ( stay ( at ( a ( lower ( body weight ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Weight) (NN loss) (NN strategy)) (VP (VBZ needs) (S (VP (TO to) (VP (VB be) (VP (VBN focused) (PP (IN on) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB stay) (PP (IN at) (NP (DT a) (JJR lower) (NN body) (NN weight))))))))))))) (. .)))
Weight loss strategy needs to be focused on how to stay at a lower body weight.
(ROOT (S (NP (NNP Birds)) (VP (VBP need) (NP (DT a) (JJ light-weight) (NN body)) (PP (IN for)) (S (VP (TO to) (VP (VB stay) (ADVP (RB aloft)))))) (. .)))