883 The physical exercise/food energy adequacy (PE/FE) protocol effects on exogenous loading of glucose (OGTT) in obesity were investigated in 43 selected (50±8yrs) obese (32.9±2.9kg/m2) females during a 10 mo. experiment. During the first 6 mo. they were submitted 3-5 x/wk to a daily 90 min. session of supervised aerobic exercise with FE to 25 kcal/kg ideal BW (during the 2nd bi-mo.). At beginning (M0) and at the end of each 2mo. (M1,M2,M3 and M5) all subjects were assessed for food intake, anthropometry and plasma triglycerides (TG), glucose (GLUC) and insulin (INS). The later two were determined also after an OGTT in the form of 75g carbohydrate breakfast mixed meal. The areas under de curve (AUC) and above the fasting-baseline (AAB) were used for INS-sensitivity. Two mo. of exercise (M1/M0) reduced BW and BMI. The INS decreasing during exercise was seen only among the high-INS level (>25uU/ml) group whereas TG reduction was only among normal insulinemies. The FE (M2/M1) sped-up the BW loss and GLUC decreasing (fast and AUC) and both continued to decrease even after returning to the ad lib. feeding (M3/M2). By stopping PE during 4mo. (M5/M3) there was an increase of BW, TG and GLUC (fasting and AUC) toward M0 values. Thus 8 wk of PE protocol increased INS sensitivity mainly in previous-active high-insulinemic obese women enhanced by restricting energy intake. Identical period of detraining reversed these trends toward initial baseline.