Lack of impact of salt restriction advice on hypertensive patients

The response of known hypertensives to advice on sodium restriction was examined as part of a 5-year study on hypertension screening in family practice. The study comprised 34 family practices, pair-matched for location, activity level, and length of time in present practice. One practice in each matched pair was randomly allocated to an experimental or a control group. All hypertensive patients in each experimental practice were exposed to a management program which included dietary counseling to restrict sodium intake. A sample of hypertensive patients (N = 1,001) in both control and experimental groups was interviewed 3.5 years into the study. Although more subjects in experimental practices reported not adding salt (22.9%) compared with those in control practices (17.3%), the results of multivariate analysis showed that type of practice (experimental or control) was not significantly associated with salt use. Salt avoidance was strongly related to lower levels of education and to sex (men were less likely to use salt). Subjects who did not use salt also tended to avoid high-sodium foods. The response to nutritional advice was less favorable than expected. Difficulties in compliance with dietary recommendations are discussed.