PROBLEM TO BE SOLVED: To provide an apparatus and method capable of performing early detection of the metabolic disease, nutritional guidance, and diagnosis of physical condition management.SOLUTION: A physical condition management apparatus includes: an application part for applying light from the outside of a living body to the inside thereof at a prescribed optical intensity； an optical intensity detection part disposed at a prescribed interval apart from the light application position by the application part for detecting the optical intensity released from the living body； a scattering coefficient calculation part for calculating a light scattering coefficient in the living body on the basis of the optical intensity detected by the optical intensity detection part； a particle size calculation part for calculating a variation in average particle sizes of lipid in a blood on the basis of the variation in the scattering coefficient； and a physical condition determination part for determining the physical condition from a time change in the variation in the average particle sizes.SELECTED DRAWING: Figure 1【課題】 代謝性疾患の早期発見や栄養指導、体調管理の診断をすることが可能な装置及び方法を提供する。【解決手段】 生体外から生体内に向けて所定の光強度で光を照射する照射部と、照射部による光の照射位置から所定間隔をあけて配置されて生体から放出される光強度を検出する光強度検出部と、光強度検出部により検出された光強度に基づき生体内における光の散乱係数を算出する散乱係数算出部と、散乱係数の変化量に基づき血液内の脂質の平均粒子径の変化量を算出する粒子径算出部と、平均粒子径の変化量の時間変化から体調を判断する体調判断部とを有する。【選択図】 図１
