Only One Acre?

Yes, and that's enough to raise a good portion of what you need for a year. An acre is a good manageable amount of land for one person to take care of. You can do a lot with a lot less and even if you live in an apartment, you can apply some of same principles.

Recent news story about other people who are doing the same thing:

http://www.journalgazette.net/article/20110306/FEAT06/303069959

Family in Pasedena who take urban homesteading to a whole new level..they raised 6,000 lbs. of food, and raise livestock, on 1/10th of an acre.

http://www.kcet.org/shows/socal_connected/content/environment/growing-your-own.html