Recently, there has been a significant increase in the number of obese people due to their lifestyle. They suffer from hypercholesterolemia, diabetes mellitus or hypertension.   In order to reduce obesity, a new dietary supplement, #001, was administered twice a day for 2 months to 20 volunteers whose BMI was quarter than 22.   As a result, the new dietary supplement, #001, reduced their obesity.   Decreases in the mean body weight, BMI and mean body fat ratio were observed.   No adverse effect was observed during this trial, even in the hematology examination. The new dietary supplement, #001, which contains food fiber compounds derived from Flammulina velutipes has been indicated to be a very effective and safe dietary supplement.