BOSTON — Dunkin’ Donuts, the food-on-the-go chain whose name celebrates a treat that’s symbolic of unhealthy eating, is trying to refresh its image by largely eliminating trans fat across its menu, Homer Simpson be damned. Dunkin’ planned to announce Monday that it has developed an alternative cooking oil and reformulated more than 50 menu items — doughnuts included. The Canton, Mass.-based chain says its menu will be “zero grams trans fat” by Oct. 15 across its 5,400 U.S. restaurants in 34 states. [via THE O.C. REGISTER]