A method for reducing body fat accumulation is provided that includes: providing a reducer of body fat accumulation, wherein the reducer comprises isomaltulose； having an individual ingest the reducer； and having the individual consume a carbohydrate having an α-1,6-glucosyl bond ratio of from 0% to less than 50% relative to the total bonds among constituent saccharides, wherein the reducer is ingested before or after or simultaneous with consuming the carbohydrate, and wherein the reducer reduces the individual's body fat accumulation caused by consuming the carbohydrate. The reducer of body fat accumulation includes isomaltulose (PALATINOSE™) as an active ingredient so that when the reducer is ingested and a carbohydrate having an α-1,6-glucosyl bond ratio of from 0% to less than 50% relative to the total bonds among constituent saccharides is consumed, accumulation of body fat resulting from ingesting the carbohydrate is reduced.
