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. 2011 Jul 27;8:53.
doi: 10.1186/1743-7075-8-53.

Garlic Improves Insulin Sensitivity and Associated Metabolic Syndromes in Fructose Fed Rats

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Free PMC article

Garlic Improves Insulin Sensitivity and Associated Metabolic Syndromes in Fructose Fed Rats

Raju Padiya et al. Nutr Metab (Lond). .
Free PMC article

Abstract

Background: Type 2 diabetes mellitus, characterized by peripheral insulin resistance, is a major lifestyle disorder of the 21st Century. Raw garlic homogenate has been reported to reduce plasma glucose levels in animal models of type 1 diabetes mellitus. However, no specific studies have been conducted to evaluate the effect of raw garlic on insulin resistance or type 2 diabetes mellitus. This study was designed to investigate the effect of raw garlic on fructose induced insulin resistance, associated metabolic syndrome and oxidative stress in diabetic rats.

Methods: Male Sprague Dawley rats weighing 200-250 gm body weight were divided into 3 groups (n = 7 per group) and fed diet containing 65% cornstarch (Control group) and 65% fructose (Diabetic group) for 8 weeks. The third group (Dia+Garl group) was fed both 65% fructose and raw garlic homogenate (250 mg/kg/day) for 8 weeks. Whole garlic cloves were homogenized with water to make a fresh paste each day.

Results: At the end of 8 weeks, serum glucose, insulin, triglyceride and uric acid levels, as well as insulin resistance, as measured by glucose tolerance test, were significantly (p < 0.01) increased in fructose fed rats (Diabetic group) when compared to the cornstarch fed (Control) rats. Administration of raw garlic to fructose fed rats (Dia+Garl group) significantly (p < 0.05) reduced serum glucose, insulin, triglyceride and uric acid levels, as well as insulin resistance when compared with fructose fed rats. Garlic also normalised the increased serum levels of nitric oxide (NO) and decreased levels of hydrogen sulphide (H2S) after fructose feeding. Although body weight gain and serum glycated haemoglobin levels of fructose fed rats (Diabetic group) were not significantly different from control rats, significant (p < 0.05) reduction of these parameters was observed in fructose fed rats after garlic administration (Dia+Garl group). Significant (p < 0.05) increase in TBARS and decrease in GSH was observed in diabetic liver. Catalase was not significantly affected in any of the groups. Administration of raw garlic homogenate normalised both hepatic TBARS and GSH levels.

Conclusions: Our study demonstrates that raw garlic homogenate is effective in improving insulin sensitivity while attenuating metabolic syndrome and oxidative stress in fructose-fed rats.

Figures

Figure 1
Figure 1
Biochemical changes after administration of garlic in fructose fed rats. Effect of garlic on blood glucose levels (A & B) and serum triglyceride levels (C & D) after 3 weeks and 8 weeks of fructose feeding. Data are shown as Mean ± SEM, *p ≤ 0.05, **p ≤ 0.01 vs Control group; †p ≤ 0.05, ††p ≤ 0.01 vs Diabetic group.
Figure 2
Figure 2
Effect of garlic administration on serum insulin levels (A), glycated haemoglobin levels (B), cholesterol levels (C) and uric acid levels (D) after 8 weeks of fructose feeding. Data are shown as Mean ± SEM, **p ≤0.01 vs Control group; †p ≤ 0.05 vs Diabetic group.
Figure 3
Figure 3
Effect of garlic administration on serum nitric oxide levels(A) and serum hydrogen sulphide levels (B) after 8 weeks of fructose feeding. (C) Effect of garlic administration on intraperitoneal glucose tolerance test. Data are shown as Mean ± SEM, **p ≤ 0.01 vs Control group; †p ≤ 0.05, ††p ≤ 0.01 vs Diabetic group.

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