Abstract: Proposed is a method for quantifying water and lipid contents in turbid media. Methods for quantifying water and lipid contents through non-invasive methods in turbid media in which scattering occurs upon penetration of near-infrared rays have yet to be proposed. In addition, existing apparatuses and methods for measuring body composition use frequency-domain and time-domain diffuse optical spectroscopy or infrared spectroscopy to measure water and lipid contents in tissue, whereby there are limitations that hardware configurations become complicated, and mass production and sales are subject to constraints. To solve such problems, proposed is a method for quantifying water and lipid contents in turbid media using narrowband diffuse reflectance spectroscopy, which uses only a near-infrared band in a range of 900 to 1,000 nm, configured such that the water and lipid contents can be accurately quantified in tissue through a simpler configuration than that in existing methods.