( Osteoporosis ( ( is ( caused ( by ( ( a lack ) ( of ( calcium intake ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Osteoporosis)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (DT a) (NN lack)) (PP (IN of) (NP (NN calcium) (NN intake))))))) (. .)))
Osteoporosis is caused by a lack of calcium intake.
(ROOT (S (NP (RB Too) (JJ little) (NN calcium)) (VP (MD can) (VP (VB cause) (NP (DT the) (NN disease) (NN osteoporosis)))) (. .)))