I just checked the Dunkin Donuts Nutrition Menu for the muffins......I am not shocked but I am definitely going to skip the muffin next time!
http://www.dunkindonuts.com/content/dunkindonuts/en/menu/muffins.html?DRP_FLAVOR=Warm+Cinnamon+Swirl
The warm cinammon swirl muffin has 23 grams of fat and 630 calories! Ay dios mio! For less of a fat count you can have 4.5 six inch Subway roast beef sandwiches (they have approximately 5 grams of fat each)!!