The effects of sour tea (Hibiscus sabdariffa) on hypertension in patients with type II diabetes

Abstract

To compare the antihypertensive effectiveness of sour tea (ST; Hibiscus sabdariffa) with black tea (BT) infusion in diabetic patients, this double-blind randomized controlled trial was carried out. Sixty diabetic patients with mild hypertension, without taking antihypertensive or antihyperlipidaemic medicines, were recruited in the study. The patients were randomly allocated to the ST and BT groups and instructed to drink ST and BT infusions two times a day for 1 month. Their blood pressure (BP) was measured on days 0, 15 and 30 of the study. The mean of systolic BP (SBP) in the ST group decreased from 134.4 ± 11.8 mm Hg at the beginning of the study to 112.7 ± 5.7 mm Hg after 1 month (P-value o0.001), whereas this measure changed from 118.6 ± 14.9 to 127.3 ± 8.7 mm Hg (P-value ¼ 0.002) in the BT group during the same period. The intervention had no statistically significant effect on the mean of diastolic BP (DBP) in either the ST or BT group. The mean pulse pressure (PP) of the patients in the ST group decreased from 52.2±12.2 to 34.5±9.3 mm Hg (P-value o0.001) during the study, whereas in the BT group, it increased from 41.9 ± 11.7 to 47.3 ± 9.6 mm Hg (P-value ¼ 0.01). In conclusion, consuming ST infusion had positive effects on BP in type II diabetic patients with mild hypertension. This study supports the results of similar studies in which antihypertensive effects have been shown for ST.

Anti-hypertensive medicinal plants and their mode of action

“…A similar effect was observed in the case of hypertension in patients with type II diabetes(Mozaffari-Khosravi et al , 2009) and mild to moderate hypertensive subjects(Nwachukwu et al , 2015). A recent meta-analysis of randomized controlled trials was conducted by Sahebkar et al which showed a significant effect of H. sabdariffa supplementation in lowering both SBP and DBP.…”

Roselle calyces (Hibiscus sabdariffa), an alternative to the food and beverages industries: a review

“…This could demonstrate the effect of the Roselle calyces extract as a diuretic and as an ACE inhibitor (Herrera-Arellano et al 2007). Mozaffari-Khosravi et al (2009) found that the daily consumption of Roselle calyces infusion lowered the blood pressure in diabetic patients. The infusion of Roselle (2 g in 250 mL of hot water for 20 to 30 min) was supplied for 1 month to patients in the morning and evening.…”

Effects of Hibiscus sabdariffa Linn. Aqueous Extract on Oxidative Stress and T Lymphocyte Population in Spleen of Streptozotocin-induced Diabetic Rats

“…Chao dan Yin (2008) pula mendapati bahawa buah rosel mempunyai sifat sebagai antioksida dan antimikrob. Selain itu, H.sabdariffa juga telah dibuktikan mampu menjadi agen antidiabetes disebabkan keupayaannya dalam menurunkan aras hiperglisemia dan tekanan oksidatif (Mozaffari-Khosravi et al 2009). …”