connect if/thenstatement with submit form function

Hello Community,

I was wondering if I can combine the if then statment with the submit form function. 

I already managed to send specific data of specific fields to an email address after hitting the "submit form" button I created.

I was wondering if I can just send the fields where information has been changed? 

if "data in field A was changed" then send it

if "data in field has not been changed" don´t send it

Thanks in advance!