I love Dr. Pepper but I can't drink it any more b/c I am on a diet!
Oh no! I used to drink Dr Pepper too. A high school boyfriend converted me. 
It was first created in 1880 by a pharmacist named Charles Alderton in Waco, tx and first served in 1885.  My sister just got me started on a seltzer water that is flavored like Dr. Pepper though. it is sold by Kroger.