There are herbivores and carnivores; now we also have locavores.
Locavores are dedicated to eating food grown near home. Some set a limit of 100 miles, some a modest 50. This eating program makes it all but impossible to drink coffee or eat chocolate chip cookies. Often, bread is taboo because the wheat is grown far away.
The idea is to save on fossil fuel which is used to transport out-of-season foods for thousands of miles, to raise some food for oneself, and to get in touch with a community of local farmers.