The present invention relates to a load cell module configured to be insertedly disposed in shoes and a weight management service system using the same. The load cell module comprises: a main case (10) including a load cell accommodating space (11) projected upwardly at one side thereof and a circuit and battery accommodating space (12), which are formed therein; a load cell (20) accommodated in the load cell accommodating space (11); a main PCB (30) including a tilt sensor (31) and a transmission and reception unit (32), the main PCB being accommodated in the circuit and battery accommodating space 12; and a battery (40) accommodated in the circuit and battery accommodating space 12, whereby the load cell module is detachably mounted to a heel part (H) of a midsole (M) of a shoe.