Study design and baseline characteristics of a combined educational and environmental intervention trial to lower sodium intake in Swiss employees.

Beer-Borst, Sigrid Maria; Luta, Xhyljeta; Hayoz, Stefanie; Sommerhalder, Kathrin; Gréa Krause, Corinna; Eisenblätter, Julia; Jent, Sandra; Siegenthaler, Stefan; Aubert, Rafael; Haldimann, Max; Strazzullo, Pasquale (2018). Study design and baseline characteristics of a combined educational and environmental intervention trial to lower sodium intake in Swiss employees. BMC public health, 18(1), p. 421. BioMed Central 10.1186/s12889-018-5366-0

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Blood pressure is a primary cardiovascular disease risk factor. Population-wide governmental strategies aim to reduce lifestyle and dietary risk factors for hypertension, one of which is an unbalanced diet with high sodium and low potassium intakes. Nutrition interventions in the workplace are considered a promising approach in encouraging health-promoting behaviors. We developed and conducted the health promoting sodium reduction trial "Healthful & Tasty: Sure!" in worksites in the German-speaking part of Switzerland from May 2015 to Nov 2016, for which we present the study protocol and baseline characteristics.


Healthful & Tasty, a cluster nonrandomized single-arm trial with calibration arm, aimed to demonstrate the effectiveness of a combined educational and environmental intervention in the workplace in reducing employees' average daily sodium/salt intake by 15%. To this end, health and food literacy of employees and guideline compliance among the catering facility team needed to be improved. The primary outcome measure was sodium/salt intake estimated from sodium excretion in a 24-h urine sample. Secondary outcome measures included changes in the overall qualitative diet composition, blood pressure, anthropometric indices, and health and food literacy. Of eight organizations with catering facilities, seven organizations took part in the nutrition education and catering salt reduction interventions, and one organization participated as a control. Overall, 145 consenting employees were included in the staggered, one-year four-phase trial, of which 132 participated in the intervention group. In addition to catering surveys and food sampling, the trial included five follow-up health assessments including questionnaires, blood pressure measurements, anthropometrics, and sodium, potassium, and iodine intake measurements obtained from 24-h and spot urine samples, and a food record checklist. Exploratory and hypothesis generating baseline statistical analysis included 141 participants with adequate 24-h urine samples.


Despite practice-driven limitations to the study design and small cluster and participant numbers, this trial has methodological strength and will provide important insights into the effectiveness of a combined educational and environmental intervention to reduce salt intake among female and male Swiss employees.


German Clinical Trials Register, DRKS00006790 . Registered 23 September 2014.

Item Type:

Journal Article (Further Contribution)


04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Social and Preventive Medicine (ISPM)

UniBE Contributor:

Beer-Borst, Sigrid Maria, Luta, Xhyljeta, Hayoz, Stefanie, Gréa, Corinna


600 Technology > 610 Medicine & health
300 Social sciences, sociology & anthropology > 360 Social problems & social services




BioMed Central


[841] Enviromental and educational intervention in communal catering to lower salt intake in the Swiss working population Official URL




Doris Kopp Heim

Date Deposited:

03 Apr 2018 13:51

Last Modified:

05 Dec 2022 15:12

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

24-h urine Blood pressure Educational intervention Environmental intervention Food literacy Health literacy Potassium Salt Sodium Workplace health promotion trial




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