PROBLEM TO BE SOLVED: To provide information for supporting achievement of a weight loss target of a user to the user.SOLUTION: A weight loss support device 10 is configured so that: an acquisition part 12 acquires measured ketone body density obtained by measuring a ketone body discharged from a user's body； a calculation part 14 performs at least one of determination of expectation of achievement of the weight loss target, and calculation of a prescribed physical amount which is criterion of the achievement of the weight loss target, based on first information for regulating a relationship between the density of the ketone body discharged from a human body and a fat consumption speed of a human body stored in a storage part 20, the measured ketone body density acquired by the acquisition part 12, and the weight loss target of the user which is set； and an output part 16 outputs the determination of expectation of achievement of the weight loss target or the calculation result of the prescribed physical amount which is criterion of the achievement of the weight loss target on the calculation part 14 as support information for supporting achievement of the weight loss target.SELECTED DRAWING: Figure 1【課題】利用者の減量目標の達成を支援する情報を利用者に提供する【解決手段】減量支援装置１０は、取得部１２が利用者の体から排出されたケトン体を測定した測定ケトン体濃度を取得し、演算部１４が、記憶部２０に記憶された、人体から排出されたケトン体の濃度と人体の脂肪消費速度との関係を規定する第１情報と、取得部１２によって取得された測定ケトン体濃度と、設定された利用者の減量目標と、に基づいて、減量目標の達成見込みの判定、及び、減量目標の達成の目安となる所定の物理量の演算の少なくとも一方を行い、出力部１６が、演算部１４による減量目標の達成見込みの判定又は減量目標の達成の目安となる所定の物理量の演算結果を、減量目標の達成を支援する支援情報として出力する。【選択図】図１
