Diets for men in their prime
( Diets ( for ( men ( in ( their prime ) ) ) ) )
(ROOT (NP (NP (NNS Diets)) (PP (IN for) (NP (NP (NNS men)) (PP (IN in) (NP (PRP$ their) (JJ prime)))))))
A diet for men made up completely of meat. 
( ( ( A diet ) ( for men ) ) ( ( ( ( made up ) completely ) ( of meat ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN diet)) (PP (IN for) (NP (NNS men)))) (VP (VBD made) (PRT (RP up)) (ADVP (RB completely)) (PP (IN of) (NP (NN meat)))) (. .)))