$this->auth = Zend_Auth::getInstance();
// Creating user object using the email stored in session
$user = new Master_Model_User( $this->auth->getIdentity()->email ); 
$user->status = 1;
$user->Save(); // Saves user data
$this->auth->getStorage()->write($user);

A very simple example of how you can refresh the data into an Identity instance generated by Zend Auth

Refreshing Zend Framework Auth Identity

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