J Clin Med Res
Journal of Clinical Medicine Research, ISSN 1918-3003 print, 1918-3011 online, Open Access
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Letter to the Editor

Volume 10, Number 3, March 2018, pages 279-280


Optimal Weight Gain During Pregnancy in Japanese Women: Is It Okay?

Shunji Suzuki

Department of Obstetrics and Gynecology, Japanese Red Cross Katsushika Maternity Hospital, 5-11-12 Tateishi, Katsushika-ku, Tokyo 124-0012, Japan

Manuscript submitted December 31, 2017, accepted January 16, 2018
Short title: Optimal Weight Gain During Pregnancy
doi: https://doi.org/10.14740/jocmr3348w

To the Editor▴Top 

In this journal, recently we have investigated some reports concerning the optimal gestational weight gain (GWG) in the healthy Japanese women with favorable perinatal outcomes of singleton pregnancy [1-3]. In our reports [2], for example, the average GWG in the normal-weight (body mass index (BMI) during pre-pregnancy, kg/m2: 18.5 - 24.9) women with the favorable perinatal outcomes was suggested to be 11.4 kg in the consecutive deliveries at Japanese Red Cross Katsushika Maternity Hospital in the Tokyo downtown; however, Nomura et al [4] reported in another journal that the average GWG for the favorable outcomes seemed to be 10.2 kg (P < 0.05 by the Student’s t-test) for the normal-weight women in the consecutive deliveries at Japanese Red Cross Medical Center in the central Tokyo (Fig. 1).

Figure 1.
Click for large image
Figure 1. Map of Tokyo, Japan showing the places of Japanese Red Cross Katsushika Maternity Hospital (open circle) and Japanese Red Cross Medical Center (closed circle).

Based on the reports [1-4], there were some differences in some clinical backgrounds between the pregnant women living in the two areas of Tokyo. The rate of underweight (BMI < 18.5) women during pre-pregnancy in the central Tokyo was higher significantly than that in the Tokyo downtown (25.6% vs. 9.6%, P < 0.05 by the X2 test), although there was no significant difference in the rate of normal women between the two areas (82.1% vs. 77.7%). Both rates of underweight women in the two areas are different significantly from the average rate in the same-aged women in Japan (vs. about 20%, P < 0.05).

The annual income per household in the central Tokyo is about 7 million Japanese yen (= $63,000), which has been reported to be about two times that of Tokyo downtown (about 3.3 million Japanese yen) [5, 6]. We believe that Japan is not a poor country; however, the existence of health inequality based on the difference of rich and poor has been becoming a serious problem in Japan [5, 6]. In the market survey in Tokyo downtown, more frequent sales of carbohydrate-based pre-packaged foods and lower sales of vegetables have been pointed out compared to the center of Tokyo. These have been also suggested to be related to the differences in healthy life span in Tokyo, Japan [5, 6].

To lead to the favorable perinatal outcomes, we had been exploring the optimal GWG of Japanese women; however, what really matters may not be indicated by the range of body weight only.


References▴Top 
  1. Suzuki S. Optimal weight gain during pregnancy in Japanese women. J Clin Med Res. 2016;8(11):787-792.
    doi pubmed
  2. Suzuki S. Gestational weight gain in Japanese women with favorable perinatal outcomes. J Clin Med Res. 2017;9(1):64-66.
    doi pubmed
  3. Suzuki S. Optimal pre-pregnancy body mass index cut-offs for obesity in Japan. J Clin Med Res. 2017;9(2):180-181.
    doi pubmed
  4. Nomura K, Kido M, Tanabe A, Nagashima K, Takenoshita S, Ando K. Investigation of optimal weight gain during pregnancy for Japanese Women. Sci Rep. 2017;7(1):2569.
    doi pubmed
  5. Ikeda T. Mainichi Forum: For the future of Japan (in Japanese). https://mainichi.jp/articles/20160509/org/00m/010/042000c (December 31, 2017).
  6. The Asahi Shimbun: Income differentials (in Japanese). http://www.asahi.com/topics/word (December 31, 2017).


This article is distributed under the terms of the Creative Commons Attribution Non-Commercial 4.0 International License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Journal of Clinical Medicine Research is published by Elmer Press Inc.



 

 

 

 
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Journal of Clinical Medicine Research, monthly, ISSN 1918-3003 (print), 1918-3011 (online), published by Elmer Press Inc.        
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