title: Track change of user meta data in Wordpress
body: <p>OK so I've managed to successfully create a few new user meta fields, which the user updates themselves with a form.</p>
  
  <p>I would however like to track the progress of a user with these fields. Say the fields are 'weight' or 'bodyfat', rather than it just replacing the value it would be great if I could somehow log a value name, date and value all at once. </p>
  
  <p>The dream would to then plot these values on a line chart, but thats another question.</p>
  
  <p>Thanks</p>