Background: We previously reported the nutritional characteristics and effects of the
DASH-JUMP diet, which is a WASHOKU-modified DASH diet, in Japanese participants with
untreated high-normal blood pressure or stage 1 hypertension. The dietary adherence of the DASH
diet in Japanese participants has never been evaluated before.
Objective: We aimed to assess the relationships between dietary adherence, self-efficacy, and health
behavior change among study participants who received the DASH-JUMP diet by home delivery.
Methods: Participants were treated with the DASH-JUMP diet for 2 months and consumed their
usual diets for the next 4 months. We conducted surveys using the stage of behavior change model
questionnaire and the modified perceived health competence scale Japanese version questionnaire at
baseline and 1, 2, 3, and 6 months to assess dietary adherence.
Results: Forty-three participants (25 men, 18 women; mean age 53.6 ± 8.2 years) returned completed
questionnaires, which we analyzed. Health behavior change was motivated by previous behavioral
changes and improved biomarkers. The improvement and maintenance of self-efficacy
were deeply related to health behavior change and previous self-efficacy. The experience of the
DASH-JUMP study for participants included three processes to improve lifestyle habits: Phase 1,
reflecting on previous lifestyle habits; Phase 2, learning through new experiences and the acquisition
of knowledge; and Phase 3, desiring to maintain their own health.
Conclusion: It indicated that the DASH-JUMP diet significantly increased self-efficacy and promoted
health behavior change.