Only send notification when certain items are changed

I have a List with two workflows. One that runs when an item is created/updated, and another that runs daily to perform a calculation. Emails go out when an item is created, updated, and expires.

There is a column Days Left that serves as a countdown depending on the number of days left until the Expiration date. Naturally this field updates everyday with the kickoff of the daily workflow.

My problem is that the Owner gets an email everyday because technically the item has changed since the Days Left is updated.

How do i say:

if one of the other fields is updated:

   send a notification and update the days left.

else:

   update days left

Right now I'm using if Current:Item equals Modified...