The present invention discloses serum remnant-like lipoprotein concentration regulators containing triglyceride of medium-chain fatty acids, wherein 90% or more by weight of the fatty acids as components of the medium-chain triglyceride are saturated fatty acids having 8 and 10 carbon atoms; weight ratio between the saturated fatty acids having 8 carbon atoms and those having 10 carbon atoms is 60/40 to 85/15; and the proportion of the saturated fatty acids having 8 carbon atoms in all the fatty acids bonding to the second position of the triglyceride is 60 to 85 % by weight. The present invention also discloses foods for controlling the concentration of serum remnant-like lipoproteins and pharmaceutical compositions for controlling the concentration of serum remnant-like lipoproteins, which contain the serum remnant-like lipoprotein concentration regulator. The foods for controlling the concentration of serum remnant-like lipoproteins can be easily used without concerning about side effects and restrictive diet.