This study was carried out to investigate the effect of body weight reduction of noddle contained glucomannan in high fat diets-induced obese rats. Male Spraque-Dawley rats were randomly assigned to control and high fat diets groups for 4 weeks. Four weeks later, the control and high fat diet grpups were rearranged into 4 groups by different levels of nuddle containing glucomannan. After 5 weeks of feeding, serum and whole blood was analyzed. Obesity index was significantly lower in the group fed nuddle contained glucomannan than that of high fat diet groups. The status of white blood cells in hematological examination was significantly higher in rats fed high fat diet and was not significantly different by fed nuddle. Serum albumin levels were not significantly different although glucose levels in serum was significantly different among groups. Serum triglyceride and Total cholesterol levels were the highest levels in rats fed high fat diets and showed the lowest levels in rats fed nuddle.