We demonstrated that bitter melon was effective in ameliorating the fructose diet-induced hyperglycemia, hyperleptinemia, hyperinsulinemia, and hypertriglyceridemia as well as in decreasing the levels of free fatty acid (FFA) (P<0.001, P<0.05, P<0.05, P<0.05, P<0.05, respectively). Bitter melon reversed fructose diet-induced hypoadiponectinemia (P<0.05), which provides a therapeutic advantage to insulin resistance in improving insulin sensitivity. Additionally, bitter melon decreased the weights of epididymal (P<0.05) and retroperitoneal white adipose tissue (WAT) (P<0.05). Bitter melon increased the expression of peroxisome proliferator-activated receptor gamma (PPAR gamma) in white adipose tissue (WAT). Conversely, bitter melon decreased the expression of leptin in WAT. Furthermore, we demonstrate that bitter melon significantly increases the mRNA expression and protein of glucose transporter 4 (GLUT4) in skeletal muscle.
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