Objective:: To examine the associations of dietary sodium and potassium, as reflected by the urinary sodium/potassium excretion, and calcium intake with blood pressure and the prevalence of hypertension among older Chinese vegetarians in Hong Kong. Design:: Cross-sectional study. Setting:: Research clinic in a teaching hospital in Hong Kong. Subjects:: A total of 111 ambulatory vegetarians over the age of 55 were recruited from members of religious organizations or old age hostels. Main outcome measures:: Hypertension was defined as supine blood pressure [greater than] 140/90 mmHg or a history of hypertension. Dietary sodium, potassium and calcium intakes were assessed by 24[??]h recall method or fasting urinary sodium or potassium/creatinine ratios. Results:: Seventy-one subjects (64%) were found to have hypertension. Compared with normotensive subjects, hypertensive subjects had lower calcium intake (411[plus or minus]s.d. 324 vs 589[plus or minus]428[??]mg, P=0.04), but higher urinary sodium/creatinine ratio (32.6[plus or minus]19.3 vs 21.0[plus or minus]12.4, P=0.00) and sodium/potassium ratio (4.7[plus or minus]2.8 vs 3.4[plus or minus]2.3, P=0.02). Among 88 subjects not taking diuretics or antihypertensive drugs, systolic blood pressure was related to calcium intake (r=-0.40), urinary sodium/creatinine ratio (r=0.39), urinary sodium/potassium ratio (r=0.30) and age (r=0.23). Diastolic blood pressure was related to urinary sodium/creatinine (r=0.29). Twenty-three subjects with high urinary sodium/potassium and low calcium intake and 16 subjects with low urinary sodium/potassium ratio and high calcium intake differed markedly with respect to systolic blood pressure (159[plus or minus]26 vs 130[plus or minus]15[??]mmHg) and prevalence of hypertension (78% vs 25%). Conclusion:: Older Chinese vegetarians are predisposed to hypertension because of their sodium-rich but calcium-deficient diets. European Journal of Clinical Nutrition (2003) 57, 299-304. doi: 10.1038/sj.ejcn.1601553 Keywords: hypertension, vegetarianism, calcium, sodium, diet, aged, Author(s): T C Y Kwok [1]; T Y K Chan [1]; J Woo [1] Introduction Vegetarians have lower blood pressure than non-vegetarians after adjustments for the effects of age, sex [...]