Inclusion Criteria:  Diagnosis of obesity type I according to body mass index (IMC: 30.0 - 34.9 kg/m2) Body weight without variations above or under 5% in the last three months before entering the study Fasting plasma glucose: <126 mg/dL Total cholesterol: <240 mg/dL Triglycerides: <400 mg/dL Women in childbearing years must have a contraceptive method Letter of consent and release signed by each patient  Exclusion Criteria:  Women with confirmed or suspected pregnancy Women under lactation and/or puerperium Known uncontrolled renal, hepatic, cardiovascular or thyroid disease Physical impossibility for taking pills Known hypersensibility to the Momordica charantia or placebo