To reduce amounts of fat accumulated in abdominal cavity and to prevent or ameliorate visceral fat type obesity considered to be a main factor of metabolic syndrome, there is provided an agent or a food or drink, including as an active ingredient 3-O-.beta.-D-glucopyranosyl-4-methylergost-7-en-3-ol, an organic solvent extract, a hot water extract, a squeezed liquid of a Liliaceae plant or a fraction thereof which contains the compound.