Abstract: A body weight management device includes a body weight obtainment configured to obtain body weight data that includes a measurement subject's body weight measurement value at a predetermined intra-day timing between waking up and sleeping and a measurement date/time of the body weight measurement value, a body weight storage unit configured to store the body weight data obtained by the body weight obtainment unit in a memory, a representative body weight calculation unit configured to calculate a representative body weight value based on the body weight measurement values in the body weight data in a predetermined period, which are stored in the memory, and a target calculation unit configured to calculate a target value to be a target when a body weight value is measured at the predetermined timing, based on the calculated representative body weight value, an intra-day target weight-loss value, and a measurement value to be a weight variation factor.

Abstract: To correctly recognize the 0 kg state and to reduce the time required for weight measurement. A body composition meter including a load cell for measuring a weight includes step of performing a measurement of an output value of the load cell in an initial state on which a measuring target does not ride, a storage unit for storing a plurality of measured output values of the initial state, step for creating 0 kg reference value data when variation of the plurality of output values in the initial state is within a predetermined range, and step of measuring using the initial reference value when measuring the weight with the load cell.

Abstract: A device includes a body weight obtainment unit for obtaining measurement data; a storage unit for storing the measurement data; a target calculation unit that, based on the measurement data in, calculates a target diurnal fluctuation amount including a body weight fluctuation amount during sleep and a body weight diurnal target increase/decrease amount; and a computation unit that, based on the target diurnal fluctuation amount, calculates a target value to serve as a target when measuring a pre-sleep body weight value at a second timing before the measurement subject sleeps relative to a post-waking body weight value that is measured at a first timing after the measurement subject wakes. The target calculation unit calculates the diurnal target increase/decrease amount based on the measurement data in the storage unit so that the diurnal target increase/decrease amount is within a predetermined increase/decrease percentage range of the post-waking body weight value.

Abstract: To correctly recognize the 0 kg state and to reduce the time required for weight measurement. A body composition meter including a load cell for measuring a weight includes step of performing a measurement of an output value of the load cell in an initial state on which a measuring target does not ride, a storage unit for storing a plurality of measured output values of the initial state, step for creating 0 kg reference value data when variation of the plurality of output values in the initial state is within a predetermined range, and step of measuring using the initial reference value when measuring the weight with the load cell.