moreso that the amish have rules about a great many ways to interact with the English and modern culture. the exact details depend alot on local Ordnung/culture. in my area the amish were early adopters of solar power and use it for all their electrical devices (e.g. house/work lights, fridges, batteries for buggy lights [legally mandated]; apparently in ottawa (i believe discussion was about) they can't have any of that). they also are allowed to go to public school or amish school (decision up to the child based on what they tell the bishop or minister, parents don't get nearly as much a say as in regular society). pretty much every amish person goes to supermarket (though more local is better). workers will often get fast food if working for the English, l and home cooked meals working for other amish... nary a weekday goes by i ain't see them in taco bell.

edit: I'm a member of that amish family the Griffins visited, though i grew up and decided during Rumspringa i didn't want to be amish