Effect of Gymnema Sylvestre on Patients With Impaired Glucose Tolerance.

The target is to evaluate the effect of the administration of Gymnema Sylvestre on glycemic control, insulin secretion and insulin sensibility on patients with IGT. The investigators will conduct a double-blind trial, randomized, placebo control group, each group 12 female and male patients, between 30 and 59 years old with IGT (2-h values in the oral glucose tolerance test, OGTT) from 140 mg / dL to 199 mg / dL), Body Mass Index (BMI) from 25 to 34.9 kg / m2. Randomization will determine who will receive the intervention during the 9-week trial (Gymnema Sylvestre capsules, 300 mg 2 times daily with the first bite of breakfast and dinner or homologated placebo capsules). The clinical findings and laboratory tests include a metabolic profile and biosafety, which will be made at baseline and at week 9. Body weight, body fat, BMI and blood pressure will be determined during the initial and final visit. Adverse events and adherence to treatment will be documented. Statistical analysis: Mann-Whitney U test, Wilcoxon and Fisher exact test. It is considered with significance at p <0.05.

Inclusion criteria

• BMI: 25.0-34.99 kg / m2.
• Diagnosis of IGT (2h-OGTT Values between 140mg / dl and 199mg / dl.)
• Written informed consent.
• body weight stable over the last 3 months.
• Women in follicular phase of the menstrual cycle (days 3 to 8 of the cycle) at the time of laboratory tests.
• Women who are not contemplated get pregnant within the next 6 months.

Exclusion criteria

• Women pregnant or breastfeeding.
• Physical or mental disability that makes it impossible to perform the intervention.
• Diagnosis of hypertension or heart failure.
• Smokers.
• Untreated thyroid disease.
• Consumption of oral agents or other medications or supplements with proven properties that modify the behavior of glucose and lipids (oral hypoglycemic agents, insulin, lipid-lowering).
• Diagnosis of liver disease or elevation twice of the upper normal value of liver enzymes.
• Diagnosis of renal disease or creatinine > 1.5 mg / dl.
• Diagnosis of Type 2 Diabetes Mellitus (T2DM) Fasting glucose ≥ 126 mg / dL and/or 2h-OGTT ≥ 200 mg / dL and/or A1C ≥ 6.5%.
• Total Cholesterol ≥ 280 mg/dL.
• Triglycerides ≥ 300 mg/dL.
• Known allergy to calcined magnesia or Gymnema sylvestre.