If my emails need to change from for example [email protected] to [email protected] will I lose my Graal Data?  

yes im guessing cause its gonna be a differnt account  

Yes, unless you changed your account identity email (which I don't know how to do).  

So many people asking same question this week.
Changing your email address doesnt matter! Your old email account still exists, and its not like Graal emails you anything (besides device confirmation). So why not just stay logged into the current graal account you have?  

If you've already identified before, then no. No one can change your email now except for Unixmad or Stefan or I think Bell.