Excess dietary sodium and inadequate potassium intake by hypertensive patients in Italy : results of the MINISAL-SIIA study program

INTRODUCTION: The aim of the study was to assess the age-specific, sex-specific, and region-specific average sodium and potassium intake and its association with anthropometric characteristics in a sample of the Italian adult hypertensive population. METHODS: A total of 1232 hypertensive patients were recruited consecutively by 47 centers recognized by the Italian Society of Hypertension. The enrolled participants were on stable antihypertensive treatment. Anthropometric indices, blood pressure, 24-h urinary sodium, and potassium excretion were measured and used as proxy for the average daily sodium and potassium intake. RESULTS: The average sodium intake was 172mmol (or 10.1g of salt/day) among men and 138 (or 8.1) among women, with no difference among geographical areas. Over 90% of men and 81% of women had a consumption higher than the recommended standard dietary intake of 5g/day. The average potassium intake was 63 and 56mmol, respectively in men and women, again without geographical differences, nearly 92% of men and 95% of women having an intake lower than the recommended intake (100mmol/day or 3.9g/day). There was a significant trend to a gradual decrease in sodium intake with age in both sexes (P<0.001). There was also a direct association between BMI and sodium intake in both sexes, this association being independent of age (P<0.001). CONCLUSION: In this national sample of the Italian hypertensive population, dietary sodium intake was largely higher and potassium intake much lower than the recommended intakes, and this was true for all geographical areas. Overweight and obese hypertensive patients had particularly high sodium intakes.