The objective of this study was to evaluate the hygienic-sanitary conditions of hospital nutrition services according to internal and external auditors, before and after intervention, based on the requirements of Good Hygiene Practices. Fifteen hospital nutrition services were evaluated based on a checklist applied by internal auditors and by an external auditor. The intervention program was prepared and implemented in all the locations over one year, and was composed of four points: 1) training; 2) preparation of the action plan; 3) preparation of the documentation; 4) monthly visits to motivate the food handlers and responsible technicians, accompaniment and assistance in the implementation of Good Hygiene Practices. An improvment in the application of Good Hygiene Practices was observed in the hospital nutrition services after the systematic intervention, in the view of both the internal and external auditors, except the requirement related to operational aspects, which had a low percentage of adequacy, both before and after the intervention Before the intervention, there was a significant difference between the evaluation of the internal auditors and the external auditor, which was not found later. These results suggest that the systematic intervention assisted in the adoption of Good Hygiene Practices by hospital nutrition services, according to both the internal and external auditors, and contributed to increasing the knowledge of the internal auditors.(AU)