The nation’s leanest state is taking aim at junk food in school cafeterias as it considers the nation’s toughest school trans-fat ban, the Associated Press reports. A Colorado House committee was scheduled to hear a bill Thursday to forbid any trans-fat in school food – not just the food served through regular cafeteria lunches. That would mean vending machines, after-school bake sales and popular “a la carte” items on lunch lines such as ice creams or pizza would have to be produced without artery-clogging trans fats. Several states already limit trans-fat in school cafeterias, but none has a trans-fat ban that extends before and after school. Delaware and California, for example, both ban school food with trans-fat, but not at all after-school activities…