Improved metabolic control by Ipomoea batatas (Caiapo) is associated with increased adiponectin and decreased fibrinogen levels in type 2 diabetic subjects
Article first published online: 28 JUN 2008
© 2007 The Authors Journal Compilation © 2007 Blackwell Publishing Ltd
Diabetes, Obesity and Metabolism
Volume 10, Issue 7, pages 586–592, July 2008
How to Cite
Ludvik, B., Hanefeld, M. and Pacini, G. (2008), Improved metabolic control by Ipomoea batatas (Caiapo) is associated with increased adiponectin and decreased fibrinogen levels in type 2 diabetic subjects. Diabetes, Obesity and Metabolism, 10: 586–592. doi: 10.1111/j.1463-1326.2007.00752.x
- Issue published online: 28 JUN 2008
- Article first published online: 28 JUN 2008
- Received 5 March 2007; revised version accepted 21 May 2007
- beta cell function;
- glycated haemoglobin;
- high-sensitivity C-reactive protein;
- insulin sensitivity;
- lipid profile;
- oral glucose tolerance test
Aim: The extract of the white-skinned sweet potato Ipomoea batatas (Caiapo) has been shown to ameliorate glucose control by improving insulin sensitivity in patients with type 2 diabetes mellitus (T2DM). The present study was designed to further evaluate its mode of action on insulin sensitivity over an extended period of time as well as the effects on fibrinogen and other markers of low-grade inflammation.
Methods: In this randomized trial, 27 patients with T2DM on diet only received 4 g of Caiapo daily for 5 months; 34 patients placebo. Before and after therapy, insulin sensitivity [oral glucose insulin sensitivity (OGIS), as glucose clearance from oral glucose tolerance test], parameters of diabetes control, lipids, plasma adiponectin, high-sensitivity C-reactive protein (hs-CRP) and fibrinogen were measured.
Results: Following Caiapo, we observed an increase in OGIS (293 ± 15 vs. 321 ± 12 ml/m2/min, p = 0.0072) and adiponectin (5.97 ± 0.65 to 6.63 ± 0.70 μg/ml, p = 0.013), while fibrinogen decreased from 3.83 ± 0.16 to 3.64 ± 0.18 mg/ml (p = 0.02). This was associated with an improvement in glycated haemoglobin (HbA1c: 6.46 ± 0.12 vs. 6.25 ± 0.11%, p = 0.008), fasting glucose (138 ± 4 vs. 128 ± 5 mg/dl, p = 0.039) and triglycerides (2.36 ± 0.22 vs. 2.07 ± 0.25 mmol/l, p = 0.032). Body weight, lipid levels and hs-CRP were not altered. No changes were observed in the placebo group except for HbA1c, which significantly increased from 6.25 ± 0.10 to 6.50 ± 0.12% (p = 0.0001).
Conclusions: This study confirms the beneficial effects of Caiapo on glucose and HbA1c control in patients with T2DM after 5 months follow-up. Improvement of insulin sensitivity was accompanied by increased levels of adiponectin and a decrease in fibrinogen. Thus, Caiapo can be considered as natural insulin sensitizer with potential antiatherogenic properties.