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RESEARCH ARTICLE
Year : 2009  |  Volume : 5  |  Issue : 18  |  Page : 134-138 Table of Contents     

The Postprandial Hypoglycemic Activity of Fenugreek Seed and Seeds' Extract in Type 2 Diabetics: A Pilot Study


1 Department of Nutrition and Food Technology, Jordan University of Science and Technology, Jordan
2 Faculty of Pharmacy, The University of Jordan, Jordan
3 Department of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, The Hashemite University, Jordan

Date of Submission08-Oct-2008
Date of Decision08-Dec-2008
Date of Acceptance29-Jan-2009
Date of Web Publication30-Dec-2009

Correspondence Address:
Rabab F Tayyem
Department of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, The Hashemite University
Jordan
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Source of Support: None, Conflict of Interest: None


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   Abstract 

Trigonella foenum-groecum L. is directly related to the traditional use. Trigonella foenum-graecum L, have been reported to be beneficial for treating type 2 diabetes (T2D). The study was conducted to investigate the postprandial hypoglycemic effect of fenugreek seeds on patients with T2D. Pretest - posttest control group design was used to test the hypothesis that fenugreek may have a hypoglycemic effect on blood sugar. One hundred sixty-­six D2T patients were assigned into three groups: FGO (control group: placebo drink), FG2.5 (2.5g of fenugreek), and FG5 (5g of fenugreek). Participants were instructed to drink the extract and chew the seeds. Postprandial plasma glucose level was measured before and 2-hours after the administration of the treatment. Accounting for gender, age, education, physical activity, body mass index, glycemic control, and medication, patients in FG5 group showed the greatest decrease in postprandial glucose with a pretest-posttest difference (D) of - 41 ± 6.1 mg/dl. Two-hour plasma glucose dropped for patients in FG2.5, however, the drop was not statistically different from that noticed in the placebo group (D = - 24.8 ± 4.9 mg/dl vs. - 9.8 ± 2.2 mg/dl respectively). Fenugreek seeds appear to have a significant hypoglycemic activity in T2D patients.

Keywords: Type 2 diabetes (T2D); Trigonella foenum-groecum L.; Postprandial Period; Hyperglycemia; Hypoglycemia


How to cite this article:
Bawadi HA, Maghaydah SN, Tayyem RF, Tayyem RF. The Postprandial Hypoglycemic Activity of Fenugreek Seed and Seeds' Extract in Type 2 Diabetics: A Pilot Study. Phcog Mag 2009;5:134-8

How to cite this URL:
Bawadi HA, Maghaydah SN, Tayyem RF, Tayyem RF. The Postprandial Hypoglycemic Activity of Fenugreek Seed and Seeds' Extract in Type 2 Diabetics: A Pilot Study. Phcog Mag [serial online] 2009 [cited 2019 Feb 21];5:134-8. Available from: http://www.phcog.com/text.asp?2009/5/18/134/57971


   Introduction Top


Type 2 diabetes (D2T) is one of the primary threats to human health due to its increasing prevalence, chronic course and disabling complications. Diabetes and diabetes-associated complications such as atherosclerosis, and cardiovascular disease are becoming major causes of mortality. According to the World Health Organization (WHO) there were 150 million people over 20 years of age living with diabetes in 2000 and they project that by 2025 there will be 300 million people living with this condition. The increase is expected to be 42% in developed countries and 70% in developing countries [1] . In Jordan, diabetes affects a much higher proportion of people during their prime working years. Male deaths during middle age could create a significant cohort of widows, which increases the likelihood that women will live out their final years in poverty. In both humanitarian and economic terms, diabetes is one of the most costly diseases [2] . The problem of diabetes becomes more complex by the fact that diabetes mellitus is not a single disease but occurs in several forms and has complications that can affect every system in the body [3] .

Currently, there is an arsenal of synthetic hypoglycemic drugs available; however, these drugs normally cause side effects prompting the patients to stop taking the medication and T2D progresses with further acute and chronic complications and even death. For this reason, a phytomedicine capable of treating the disease at early stages, but with fewer side effects and less expensive, will be of great help to the diabetic patients specially due to the extended belief that natural treatments cause less harm to the organism [4] . There is an interest among health care providers, nutritionists, regulatory agencies, diabetic patients, and the general public to investigate the potentials of functional foods against both types of diabetes. The uniqueness of fenugreek seeds ties in its content of several highly desirable biologically active compounds having considerable potentials for the use in the food and pharmaceutical industries, particularly relative to newer developments in the area of functional foods or nutraceuticals [5] . Fenugreek, Trigonella foenum-graecum L (Leguminosae), is a medicinal plant of Mediterranean origin, used by ancient Egyptians and cultivated worldwide. Some researchers have studied two fractions of the seed, precisely the lipid extract, and the defatted seed material which contains fibers [6] . The researcher concluded that the active component was in the defatted portion of the seeds not in the lipid extract. Ribes et at (1986) further divided the defatted portion into two sub fractions namely, subfration'a' which comprised of the testa and endosperm, this subfraction is rich in fiber (79.6%) and associated with the hypoglycemic effects of fenugreek. Whereas, subfraction 'b' consisted of cotyledons and axles and is rich in proteins (52.8%) [3] . Numerous beneficial effects of fenugreek has been reported including the use of fenugreek as an antioxidant [7],[8] , anti­carcinogenic [9],[10], anti- microbial [11],[12] , anti-ulcer [13] , anti-obesity [14] , and hypocholesterolemic [15],[16]­[17] . Other desirable actions of the extracts of fenugreek include protection against hyperglycemia in patients with diabetes [18],[19],[20],[21],[22],[19] . Many studies have addressed the potential effect of fenugreek seeds on hyperglycemia, however, only a few have been subjected to studying this effect in humans. In this study, we intended to investigate the hypoglycemic activity of fenugreek seed along with the aqueous extract in patients with D2T.


   Materials and Methods Top


Plant Material and Extract Preparation:

The fenugreek seeds (Trigonella foenum graecum) were purchased from a local market. The identity of the plant species was verified by a professional taxonomist using live specimens. Voucher specimens of these herbs were stored at the faculty herbarium. Control group received a solution of 0.8 g of dextrose dissolved in 25 ml of warm water. Treatment groups (FG2.5 and FG5 groups) received fenugreek seeds soaked in dextrose solution a ratio of 1:5 (wt:vol). Fenugreek amounts used were 2.5 g and 5 g, for FG2.5 and FG5 groups respectively. After cooling down, participants were asked to drink the extract and chew the seeds.

Study Protocol

The study was conducted according to the principles stated by Declaration of Helsinki and approved by the deanship of research at Jordan University of Science and Technology (JUST).

Information about the objectives of the study and the procedure were provided in the consent form and were explained to the participants. The patients were informed about the benefits and possible risks of the study; they could withdraw at any time during the study for any personal reason, or if he or she developed an adverse reaction to the treatments. Participants were asked to sign a consent form if they agreed to participate. Upon consenting, each participant was interviewed, asked to recall food items and preparation type eaten at breakfast.

Selection Criteria

Inclusion criteria: Outpatients from either sex with diagnosis of type 2 diabetes (40-70 years old) were selected. All patients must be under medical treatment, showing either a Poor (HbA1C >8.5) or Fair control (HbA1C ≤8.5).

Exclusion criteria: Patients affected by diabetic complications or with clinical and biochemical data of nephropathy were not enrolled. Also excluded were pregnant worsen, patients with diagnosis of gestational diabetes, insulin-dependent or type 1 diabetics, people who needed to travel frequently, and hospitalized patients.

Study Design

One Hundred Sixty-six patients from both genders (females= 91, males =75) suffer from T2D were recruited from different towns in northern Jordan. Height and weight were measured to calculate body mass index (BMI). Data regarding last glycosylated test (HbA 1 C) as an indicator of glycemic control, level of physical activity, education, age, and medications used to manage diabetes, were also obtained. Pretest - posttest control group design [23] was selected to test the hypothesis that patients consuming fenugreek may have lower postprandial blood glucose level. Participants were assigned randomly into three groups in such a way that it will allow best possible matching in gender, age, education, physical activity, glycemic control, type of medication used to manage diabetes, and body mass index. The groups were as follow:

  • 1st group :FGO group (n=50; participants received a placebo drink),
  • 2nd group: FG2.5 group (n= 61; participants ingested 2.5 g of fenugreek),
  • 3rd group: FG5 group (n=55; participants ingested 5 g of fenugreek).
Participants were visited at their residences before lunch time (typical lunch time in Jordan is 2:00 p.m.). This time was chosen to catch participants in postprandial state. The rationale for selecting postprandial state not a fasting state, taking a risk of increasing variability between groups, is that we wanted to minimize the risk of developing hypoglycemia after ingesting the fenugreek. Participants in the untreated control FGO group were directed to drink the prepared solution. Participant under the two treatments groups (FG2.5 and FG5), were asked to drink the extract and chew the seeds. The assessed endpoint was proposed to be the blood glucose level 24. Blood glucose levels were measured for all participants before dose ingestion (pretest) and two hours later (posttest), using blood glucose meter (Super Glucocard II). The differences between the pretest and the posttest (D) was calculated and tested against zero.

Statistical analysis:

The distribution of the confounding variables between groups was studied using Chi-square test. Means of SD were subjected to ANOVA for a completely randomized design using the general linear procedure of SAS (SAS Institute, 1991. Version 6.0). Means comparison were analyzed using the LSD procedure of SAS. Unless otherwise stated, significance was declared at p<0.05.


   Results Top


[Table 1] indicates that participants from both genders, different level of physical activity, different levels education, and from different therapeutic approaches were distributed evenly in the groups. Chi -square showed no differences between the observed frequencies and the expected ones. There were no mean differences in age, and the last HbA 1 C reading (P > 0.05). As shown in [Figure 1], there was a dose dependant reduction in the postprandial blood glucose level such, that the higher the fenugreek dose the lower blood glucose level.


   Discussion and Conclusion Top


Patients with T2D, in most cases, have problem with insulin sensitivity rather than insulin secretion. This may explain the decrease in the pre- and post-test (D) in the placebo group. The ingestion of 2.5 g of fenugreek seeds with their aqueous extract does not seem to have significant effect. The D value observed for FG2.5 (D = -24.8 ± 9.3) was not statistically different from that observed for the FGO (D = -9.8 ± 2.2 mg/dl) group. However, administration of 5 g of fenugreek seems to be effective in achieving a greater statistically significant drop in blood glucose levels (D =-41.1 ± 7.2).

Fenugreek seeds have been known for a long time for their anti-diabetic action [25][26] . The prevalence of diabetes is becoming increasingly alarming and is projected to increase substantially over the next decades. Hence, there is an interest among health care providers to investigate the potentials of medicinal plants and functional foods against both types of diabetes. The uniqueness of fenugreek seeds lies in its content of several highly desirable biologically active compounds having considerable potentials for the use in the food and pharmaceutical industries. Xue and coworkers reported that oral administration of fenugreek extract for Streptozotocin­ induced diabetic resulted in lower blood glucose and glycosylated hemoglobin [27] . This effect of fenugreek was also observed when normal mice were used [28] . A number of investigations have been conducted to identify the factors responsible for the antidiabetic activity of fenugreek and the mechanisms involved in this effect. Fenugreek seeds contain high amount of fiber (30% soluble fiber and 20% insoluble fiber). The role of fiber in reduction blood glucose of diabetic patient has been extensively studied and well established. Therefore, another mechanism by which fenugreek seeds lower blood glucose level is due to its high content of soluble fiber which would delay the gastric emptying and interfere with glucose absorption [29] .

In conclusion this study revealed that fenugreek with such low and short treatment course, possesses a significant hypoglycemic activity. However, further investigations for long-term use are needed to support these findings.


   Acknowledgments Top


The authors would like to thank the Deanship of Research at Jordan University of Science and Technology (JUST) for financial support (project number 81/2005).

 
   References Top

1.World Health Organization, 2005. Web page; http://www.who.org (accessed: January, 2005).  Back to cited text no. 1      
2.P. Clarke, J. Leal, C. Kelman, M. Smith, S. Colagiuri. Estimating the cost of complications of diabetes in Australia using administrative health-care data. Value Health. 11: 199-206 (2008).  Back to cited text no. 2      
3.Deshpande, M. Harris-Hayes, M. Schootman. Epidemiology of diabetes and diabetes-related complications. Phys Ther. 88:1254-64(2008).  Back to cited text no. 3      
4.M.C. Revilla-Monsalve, A. Andrade-Cetto, M.A. Palomino­Garibay, H. Wiedenfeld, S. Islas-Andrade. Hypoglycemic effect of Cecropia obtusifolia Bertol aqueous extracts on type 2 diabetic patients. JEthnopharmcol. 111 636-640 (2007).  Back to cited text no. 4      
5.Ulb-richt, E. Basch, D. Burke, L. Cheung, E. Ernst, N. Giese, I. Foppa, P. Hammerness, S. Hashmi, G. Kuo, M. Miranda, S. Mukherjee, M. Smith, D. Sollars, S. Tanguay-Colucci, Vijayan N., Weissner W. Fenugreek (Trigonella foenum-graecum L. Leguminosae): An Evidence-Based Systematic Review by the Natural Standard Research Collaboration. J Herb Pharmacother.7:143-177 (2007).  Back to cited text no. 5      
6.G. Ribes, Y. Sauvaire, C. Da Costa, J.C. Baccou, M.M. Loubatieres-Marian. Antidiabetic effects of subfractions from fenugreek seeds in diabetic dogs. Proc Soc Exp Biol Med. 182:159 66 (1986).  Back to cited text no. 6      
7.S. Sinha, A.K. Gupta, K. Bhatt. Uptake and translocation of metals in fenugreek grown on soil amended with tannery sludge: Involvement of antioxidants. Ecotoxicol Environ Saf. 67:267-277 (2007).  Back to cited text no. 7      
8.N. Venkatesan, S.N. Devaraj, H. Devaraj. A fiber cocktail of fenugreek, guar gum and wheat bran reduces oxidative modification of LDL induced by an atherogenic diet in rats. Moll Cell Biochem. 294:145-153 (2007).  Back to cited text no. 8      
9.Amin, A. Alkaabi, S. Al-Falasi, SA. Daoud. Chemopreventive activities of Trigonella foenum graecum (Fenugreek) against breast cancer. Cell Biol Int. 29:687-694 (2005).  Back to cited text no. 9      
10.J. Raju, R.P. Bird. Alleviation of hepatic steatosis accompanied by modulation of plasma and liver TNF-alpha levels by Trigonella foenum graecum (fenugreek) seeds in Zucker obese (fa/fa) rats. Int J Obes. 30:1298-1307 (2006).  Back to cited text no. 10      
11.Bin-Hafeez, R. Haque, S. Parvez, S. Pandey, I. Sayeed, S. Raisuddin. Immunomodulatory effects of fenugreek (Trigonella foenum graecum L.) extract in mice. Int Immunopharmacol. 3:257-265 (2003).  Back to cited text no. 11      
12.R. Randhir, Y.T. Lin, K. Shetty. Phenolics, their antioxidant and antimicrobial activity in dark germinated fenugreek sprouts in response to peptide and phytochemical elicitors. Asia Pac J Clin Nutr. 13:295-307 (2004).  Back to cited text no. 12      
13.R.S. Pandian, C.V. Anuradha, P. Viswanathan. Gastroprotective effect of fenugreek seeds (Trigonella foenum graecum) on experimental gastric ulcer in rats. J Ethnopharmacol. 81:393-­407(2002).  Back to cited text no. 13      
14.T. Handa, K. Yamaguchi, Y. Sono, K. Yazawa. Effects of fenugreek seed extract in obese mice fed a high-fat diet. Biosci BiotechnolBiochem. 69:1186-1188 (2005).  Back to cited text no. 14      
15.P. Sowmya, P. Rajyalakshmi. Hypocholesterolemic effect of germinated fenugreek seeds in human subjects. Plant Foods Hum Nutr. 53:359-365 (1999).  Back to cited text no. 15      
16.E. Basch, C. Ulbricht, G. Kuo, P. Szapary, M. Smith. Therapeutic applications of fenugreek. Altern Med Rev. 8:20-27 (2003).  Back to cited text no. 16      
17.Annida, P. Stanely Mainzen. Supplementation of fenugreek leaves lower lipid profile in streptozotocin-induced diabetic rats. JMed Food. 7:153-156. (2004).  Back to cited text no. 17      
18.G.A. Jelodar, M. Maleki, M.H. Motadayen, S. Sims. Effect of fenugreek, onion and garlic on blood glucose and histopathology of pancreas of alloxan-induced diabetic rats. Indian J Med Sci. 59:64-69. (2005).  Back to cited text no. 18      
19.B.C. Ruby, SE. Gaskill, D. Slivka, SG. Harger. The addition of fenugreek extract (Trigonella foenum-graecum) to glucose feeding increases muscle glycogen resynthesis after exercise. Amino Acids. 28:71-76 (2005).  Back to cited text no. 19      
20.M.V. Vijayakumar, S. Singh, R.R. Chhipa, M.K. Bhat The hypoglycaemic activity of fenugreek seed extract is mediated through the stimulation of an insulin signalling pathway. Br J Pharmacol 146:41-48 (2005).  Back to cited text no. 20      
21.Saxena, NK. Vikram. Role of selected Indian plants in management of type 2 diabetes: a review. J Altern Complement Med. 10(2):223-225 (2004).  Back to cited text no. 21      
22.M.Z. Gad, M.M. Ei-Sawalhi, M.F. Ismail, N.D. El-Tanbouly. Biochemical study of the anti-diabetic action of the Egyptian plants Fenugreek and Balanites. Mol Cell Biochem. 28:173 83 (2006).  Back to cited text no. 22      
23.D.T. Campbell, J.C. Stanley. Experimental and quasi­ experimental designs for research. Boston: Houghton Mifflin (1963).  Back to cited text no. 23      
24.F.C. Otieno, L. Ng'ang'a, M. Kaiiuki. Validity of random blood glucose as a predictor of the quality of glycaemic control by glycated haemoglobin in out-patient diabetic patients at Kenyatta National Hospital. East Afr Med J. 79:491-495 (2007).  Back to cited text no. 24      
25.J. Mishkinsky, B. Joseph, F.G. Suhnan. Hypoglycaemic effect of trigonelline. Lancet. 16;2:1311-1312 (1967).  Back to cited text no. 25      
26.Puri, K.M. Prabhu, P.S. Murthy. Mechanism of action of a hypoglycemic principle isolated from fenugreek seeds. Indian J Physiol Pharmacol. 46:457-462 (2002).  Back to cited text no. 26      
27.W.L. Xue, X.S. Li, J. Zhang, Y.H. Liu, Z.L. Wang, R.J. Zhang. Effect of Trigonella foenum-graecum (fenugreek) extract on blood glucose, blood lipid and hemorheological properties in streptozotocin-induced diabetic rats. Asia Pac J Clin Nutr. 16:422-6 (2007).  Back to cited text no. 27      
28.T. Zia, S.N. Hasnain, S.K. Hasan. Evaluation of the oral hypoglycaemic effect of Trigonella foenum-graecum L. (methi) in normal mice. J Ethnopharmacol. 75:191-195 (2001).  Back to cited text no. 28      
29.Z. Madar. Fenugreek (Trigonella foenum graecum) as a means of reducing postprandial glucose level in diabetic rats. Nutr Rep Int. 29:1267-1273 (1984).  Back to cited text no. 29      


    Figures

  [Figure 1]
 
 
    Tables

  [Table 1]


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