Evaluation of the effectiveness of a low sodium diet in the treatment of mild to moderate hypertension.

28 patients who had a sustained diastolic blood pressure of 95 to 104 mm Hg and who had no treatment for it for at least 13 months before the trial, but who were otherwise unselected, took part in a randomised controlled trial in which the effect of a restricted sodium diet was compared with that of a general health package. The general health package did not include any specific hypotensive procedures. Changes in blood pressure were measured at predetermined intervals over the course of a year. Within each group both systolic and diastolic blood pressure fell to a highly significant extent after a year, but there was no significant difference between the groups. It would thus seem that the antihypertensive effect of a restricted sodium diet may be related to the increased consultation and monitoring activity of such intervention rather than to the dietary manipulation itself.