NEW YORK (AP) — Weight Watchers is marking its 50th year by shedding its old publisher and hoping to expand its audience for an anniversary cookbook.

“Weight Watchers 50th Anniversary Cookbook: 270 Delicious Recipes for Every Meal,” will come out in May. The release starts a partnership between the diet company and St. Martin’s Press. Weight Watchers had previously released its cookbooks through Wiley.

According to a joint announcement Friday from Weight Watchers and St. Martin’s, the new cookbook will offer new and old recipes and “fun facts” on Weight Watchers history,

Weight Watchers and St. Martin’s plan another cookbook later in 2013 and more publications in 2014.