In this advertisement for Guardian Service the healthy way of cooking is explained. The homemaker is referred to as "Doctor Homemaker" because when she cooks the Guardian way she will be serving food that has retained its vitamins and minerals.
In the advertisement the views of nutritionist Adelle Davis are featured. Davis espoused the theory that food retains more vitamins and minerals when it is cooked in aluminum cookware, in little, if any water, and with low heat. This is the way Guardian Service is meant to be used in cooking and therefore the food delivers the proper family nourishment.