"Overwork and disease broke his health."<br/>"Overwork and disease broke <b><span style="color:#ff0000;">down</span> </b>his health."<br/><br/>"His health broke because of overwork and disease."<br/>"His health broke <b><span style="color:#ff0000;">down</span> </b>because of overwork and disease."<br/><br/>How are "break" and "break down" different in this context?