To provide a device and method capable of early detection or nutritional guidance for a metabolic disease, and diagnosis of physical condition management. The present invention has: an irradiation unit for radiating light at a predetermined light intensity from outside a living body to inside the living body； a light intensity detection unit for detecting the intensity of light emitted from the living body, the light intensity detection unit being disposed a predetermined interval from an irradiation position of light from the irradiation unit； a scattering coefficient calculation unit for calculating a scattering coefficient of light inside the living body on the basis of the light intensity detected by the light intensity detection unit； a particle diameter calculation unit for calculating an amount of variation in the average particle diameter of lipids in blood on the basis of an amount of variation in the scattering coefficient； and a physical condition determination unit for determining a physical condition from a time variation of the amount of variation in the average particle diameter.本發明所要解決的問題在於提供一種可進行代謝性疾病的早期發現和營養建議、身體狀況管理的診斷之裝置及方法。 為了解決此問題，本發明的身體狀況管理裝置，具有：照射部，其自生物體外方朝向生物體內以規定的光強度來照射光；光強度檢出部，其被配置成與藉由照射部所照射的光的照射位置相距規定間隔，並檢出自生物體放出的光強度；散射係數算出部，其基於藉由光強度檢出部所檢出的光強度來算出在生物體內的光的散射係數；粒徑算出部，其基於散射係數的變化量來算出血液內的脂質的平均粒徑的變化量；及，身體狀況判斷部，其根據平均粒徑的變化量的時間變化來判斷身體狀況。
