The book consists of twelve chapters, plus an Epilogue and an Acknowledgements section at the end. Smith and MacKinnon individually write alternating chapters, each of which covers one month from March 2005 to February 2006. In the first chapter MacKinnon tells how his idea for the 100-mile diet began and Smith agrees to try it for one year. They begin symbolically on the first day of Spring, March 21, and define 'local' as 100 miles, a convenient radius that would include the
Lower Mainland, the southern half of
Vancouver Island, and
Whatcom County and
Skagit County in
Washington state. Their exceptions to this rule include meals eaten while traveling, meals prepared by friends, and business lunches. Their initial month was expensive as they scoured grocery stores for whatever they could find. In the second chapter, Smith describes her and MacKinnon as an unwed urban couple in their early thirties with no children and living in a rented apartment. They recount how eating impacted their relationship before and after the diet, the anonymity of prepackaged foods, the traceability of their diet, and the diets of the indigenous
Coast Salish. The
farmers' market opens in May and they are able to buy local honey to replace sugar. Seafood from the
Strait of Georgia becomes a staple in their diet. The couple spend August at their cabin in northwestern British Columbia, where they fish the
Skeena River, pick wild berries, and eat whatever grows in their garden. Back in the Lower Mainland, the September harvest provides them with melons, peppers, eggplant, grapes, and tomatoes. To prepare for winter they preserved corn and tomatoes, made jam from berries, collected herbs from their community garden, and bought many potatoes. During the fall, each write on the troubles in their relationship.
David Beers, the founder of the
Tyee, hosts a 100-mile
Thanksgiving dinner for Smith while MacKinnon was away. In November, during a family emergency, MacKinnon travels to
Kamloops where he suspends his 100-mile diet a few days. They finally find a source of flour when they discover a farmer on Vancouver Island who grows his own fruits, vegetables, meats, and wheat. In December, Smith travels to
Edmonton where her grandmother feeds her microwaved pasta which she accepts. In January they find a restaurant that specializes in local cuisine and, previously vegetarians, they cook and eat beef for the first time in years. Working in
Malawi, MacKinnon is struck by the contrast between their western diet and that of the poor country's: there is ample food supplies in Malawi but most is exported to Canada and the United States who buy the food they do not require. The couple learn about
Mexican and
Maya cuisine while in
Merida, Mexico, for a wedding. The book ends with an epilogue, written by both Smith and MacKinnon six months after their one-year diet. They make a symbolic journey to
Bamfield, within their 100-mile radius, to collect sea water for its salt and prove they could obtain their own salt supply. ==Style and genre==