Weight loss maintenance for 1 year after a 6-month diet and physical activity program in obese Japanese men

Miki Eto; Hiroyuki Sasai; Takehiko Tsujimoto; Rina SO; Kiyoji Tanaka

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Weight loss maintenance for 1 year after a 6-month diet and physical activity program in obese Japanese men

VernacularTitle:食習慣改善と運動実践による減量支援に伴う体重変化: 1年後の追跡調査
Author: Miki ETO ¹ ; Hiroyuki SASAI ² ; Takehiko TSUJIMOTO ³ ; Rina SO ⁴ ; Kiyoji TANAKA ⁵
Author Information

1. Faculty of Human Sciences, Osaka University of Economics
2. Graduate School of Arts and Sciences, The University of Tokyo
3. Faculty of Human Sciences, Shimane University
4. Occupational Epidemiology Research Group, National Institute of Occupational Safety and Health
5. Research Center for Overwork-Related Disorders, National Institute of Occupational Safety and Health
Keywords: weight regain; metabolic syndrome
From:Japanese Journal of Physical Fitness and Sports Medicine 2019;68(4):251-259
CountryJapan
Language:Japanese
Abstract: This study described 1-year changes in body weight and metabolic syndrome components in middle-aged obese Japanese men participating in a 6-month weight loss program. This study comprised two phases: 6-month weight loss program and 12-month weight maintenance. Data were collected at Tsukuba, between July 2009 and February 2011. Overweight or obese Japanese men aged 40-64 years without any cardiovascular disease history participated. The primary outcome was the 18-month weight change. Secondary outcomes were 18-month changes in metabolic syndrome components. Primary analyses included all participants who had provided baseline data, and all missing follow-up values were replaced with their baseline data. Of the 58 participants, 39 (67.2%) completed all measurement visits. Their body weight decreased significantly immediately after the 6-month weight loss program (-8.0 kg; 95% confidence interval [CI]: -10.2 kg, -5.8 kg). However, it increased significantly, by 3.7 kg (95% CI: 1.4 kg, 6.0 kg), at Month 18 (a year after the program ended). The 18-month weight loss was 4.3 kg (95% CI: 2.1 kg, 6.5 kg). Among the metabolic syndrome components, visceral fat area, systolic blood pressure, and high-density lipoprotein cholesterol levels improved significantly at Month 18. The other components did not improve over the 18 months. In this study, the obese, middle-aged Japanese men experienced modest weight regains after its substantial reduction. Unlike other ethnicities, factors associated with long-term weight loss maintenance remain understudied among Japanese adults. Therefore, accumulating evidence from Japanese studies with longer follow-up is necessary in the future.