Her growing debts 'preyed on her mind'. [=she worried about her growing debts]
Too often elderly people are 'easy prey' for swindlers and other criminals.
The thought that he could have done better 'preyed on his mind'.
(..) Don't worry, I've got this. Ladies and gentlemen, honored daughters... ...while Mr. Kim, by virtue of his youth and naivet'... ...has fallen prey to the inexplicable need for human contact... ...let me step in and assure you that my research will go on uninterrupted. And that social relationships (..)2008 TvShow: The Big Bang Theory Title: The Jerusalem Duality Season: 1 Episode 12