BACKGROUND: Body composition analysis (BCA) is primarily used in the management of conditions such as obesity and endocrine disorders. However, its potential in providing nutritional guidance for patients with Alzheimer's disease (AD) remains relatively unexplored. AIM: To explore the clinical efficacy of BCA-based dietary nutrition scheme on bone metabolism in AD patients. METHODS: This retrospective study included 96 patients with AD complicated by osteoporosis who were admitted to The Third Hospital of Quzhou between January 2023 and December 2024. Based on data from previous similar studies, the patients were randomly assigned to either a routine diet (RD) group ( RESULTS: No significant differences were observed between groups in terms of age, sex, height, BMI, or other baseline data ( CONCLUSION: The human BCA-based dietary nutrition regimen plays a crucial role in improving BMD and bone metabolism, with effects that surpass those of conventional nutrition strategies. The findings of this study provide strong evidence for the nutritional management of AD patients.