In this application, an antiobesity or antihyperlipidemic food, feeding stuff or supplement containing lysine component(s) that is characterized in that said food, feeding stuff or supplement contains lysine component(s) at such rate that 40 to 160 mg in terms of free-form lysine should be taken in per kg of body weight per day, under diet conditions under which the daily protein energy composition is 20% or less, and an antiobesity or antihyperlipidemic food, feeding stuff or supplement containing lysine component(s) that is characterized by containing said lysine component(s) in an amount of 0.8 to 3.0 wt % in terms of free-form lysine on the basis of the dry matter and having a protein energy composition of 20% or less are disclosed. According to the present invention, a method that can realize a reduction in body weight or body fat, suppress weight increases, or improve hyperlipidemia for obese persons or persons concerned about increases in their body weight, safely and to the fullest extent and a method that can eliminate the fat of unnecessarily obese animals, or control obesity, can be provided.
