Los Vaqueros is a Fort Worth institution, and it often does several thousand meals a night. In August 2015, co-owner Vicki Cisneros debuted the new Blue Zones menu, with only about 5 percent of the items specially marked. Gaining Blue Zones certification involves making a number of nudge-like changes, such as: "Do riot offer soda, chocolate milk, or fruit juices as default beverages for children 's meals" and "Offer half-size portions of top-selling entrees," to support customers trying to have a lower caloric intake.

At Los Vaqueros, soft drinks were removed from the children's menu. Salt and pepper shakers were taken off the tables. It started serving one-egg omelets for brunch, and a plate-sharing charge was dropped. Cisneros still laughs about how people reacted. On the day of the new-menu launch , a crew of large men came in and sat down to order, but the hostess forgot to give them anything other than the Blue Zones breakfast menu. Rather than question it, they all got fruit and smaller omelets. The sales of Blue Zones items increased over the first year and have kept climbing.