What is the best messaging for when a user submits a form to update some fields e.g. such as in a user profile, etc. but no values were changed. 

In my situation, nothing gets updated in the DB when this occurs.

It seems unnecessary to show the user a message like "... nothing was updated because no changes were made" etc. At the same time, it seems incorrect to say "your update was successful" etc. since there were no actual updates to any values. 

What is the best messaging here, if any at all?