The present disclosure relates to a method of inhibiting a fat accumulation for a fat cell in a subject, which includes administering a fat accumulation inhibitor for a fat cell which includes a milk-derived phospholipid as an active ingredient to the subject. The present disclosure also relates to a method of inhibiting a visceral fat accumulation in a subject, which includes administering the visceral fat accumulation inhibitor which includes a sphingosine-containing phospholipid as an active ingredient to the subject. The present disclosure also relates to a method of accelerating increase and/or inhibiting decrease of an adiponectin concentration in blood, which includes administering an agent which includes a sphingosine-containing phospholipid as an active ingredient to the blood. The present disclosure also relates to a method of inhibiting a fat accumulation for a fat cell in a subject, which includes administering a milk-derived phospholipid to a subject.
