Aiming to better understand the food waste and eating habits of diners, this study determined, by sex, food consumption and plate waste in the lunch meal served to employees at a public hospital in Natal, RN, Brazil, during one week. Men consumed 34% more than women did. The average consumption of the week by men and women was 469 g. Women wasted, on average, 9% of what they placed on their plates, or 39 g per day. Men wasted, on average, 5% of what they placed on their plates, discarding 34 grams of food per day. According to these results, women wasted 4% more than men did. The average PW% of the week was of 7.7% (37 g per capita per day). The food wasted during the 5 days of distribution would have been enough to serve lunch to a total of 122 diners. The data here provided are useful for several reasons, as this study may be used as reference to evaluate food waste more accurately in the food service, to elaborate educational material to create awareness among diners and food service professionals, and to estimate the financial impact of food waste on the budget. One of the highlights of this study is the provision of data on the consumption and plate waste (% and in grams) not only by the whole population studied, but discriminated considering women and men, which is not the most conventional way presented by studies.

During 31 days, this study determined and evaluated the amount of salt (sodium chloride) per capita used in the preparation of the lunch meals in a public hospital food service in the City of Natal, RN, Brazil. The quantification of the salt was done through the weighing of the salt container in the beginning and at the end of lunch preparation. After that, the total amount found on each day was divided by the number of meals (750), and then the per capita amounts were compared to the maximum intake recomentation (5 g/day), and the maximum amount of salt estimated to be used for preparing lunch (2.5 g/day) in the food service studied, considering that this meal is planned to provide diners 50% of their caloric needs, even though the amount of salt used in the preparation of a meal does not necessarily represents the salt ingested, and plate waste should be considered as a modifying factor to salt intake. The results showed the per capita amounts of salt used for cooking lunch varied from 1.33 g to 5.87 g, and the average for the 31 days was 3.11 g. Only 14 days (45%) were under the limit line established for lunch. The lowest and highest results could be associated to cooking techniques and ingredients required in the menu. The findings of this study are important since they provide support to the implantation of a control system for the distribution of salt from the storeroom to the kitchen, as well as data to elaborate guiding material to food handlers, and also campaign material that can be used to sensitize both the food service team and dinners (employees, patients and patient companions) about the use and consumption of salt, helping to decrease the health risks associated to a high-sodium diet.