Objectives: To identify weight loss patterns observed during a specific health guidance program, and examine partici-pants' baseline characteristics and changes in their eating and exercise habits. Methods: A retrospective study was conducted. Participants (N=267) set action plans for the specific six-month intensive health guidance program provided by the National Health Insurance of a city in Tokyo, between 2011 to 2017. Cluster analysis was conducted according to participants' weight loss

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... centage at 30, 90, and 180 days after the first counseling session, and was calculated by weight measured at monthly face-to-face counseling by the registered dietitians. Data analysis of participants who lost ≥4% of their body weight (successful pattern) and others (unsuccessful pattern) were conducted separately. Chi-square and Kruskal-Wallis tests with multiple comparisons were used to examine the characteristics of each cluster. Results: Two successful weight change patterns were identified: (i) substantial-rapid and (ii) moderate-steady. Three unsuccessful weight change patterns were further identified: (iii) modest-plateau, (iv) modest, and (v) gain. Compared with unsuccessful patterns, a greater number of participants who showed successful weight change patterns had completed the health guidance program for the first time, and improved their eating and exercise habits in the program's early phase. Conclusions: Five weight loss patterns were identified in participants from this specific intensive health guidance program. Successful weight change patterns were observed in (all) participants who completed the program for the first time, and improvements in eating and exercise habits were seen in the early phase of health guidance.