Effects of Brown Rice on Obesity: GENKI Study I (Cross Sectional Epidemiological Study)
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ournal of JObesity and Chronic Diseases https://doi.org/10.17756/jocd.2018-013 Research Article Open Access Effects of Brown Rice on Obesity: GENKI Study I (Cross Sectional Epidemiological Study) Shaw Watanabe*, Shoichi Mizuno and Azusa Hirakawa Life Science Promoting Association, Japan *Correspondence to: Shaw Watanabe Abstract 25-3-1004, Daikyo-cho Purpose: Current epidemiological data are inconclusive about the effects of Shinjuku-ku, Tokyo 160-0015, Japan traditional brown rice on obesity. The purpose of this study was to explore the Tel: +81-3-5379-7785 Fax: +81-3-5379-7786 relationship between the people’s preferences for brown rice in their diet and E-mail: [email protected] obesity, by conducting a questionnaire survey focused on brown rice and natural foodstuffs. Received: January 31, 2018 Accepted: April 18, 2018 Method: A cross sectional study was performed through an individual Published: April 20, 2018 questionnaire administered to 1100 participants. Their staple food preferences Citation: Watanabe S, Mizuno S, Hirakawa A. included: polished white rice in 330, partially milled rice in 117, germinated rice 2018. Effects of Brown Rice on Obesity: GENKI in 12, brown rice in 406, Jurokkoku rice in 10, and 205 mixed brown rice and Study I (Cross Sectional Epidemiological Study). J others. Baseline and outcome variables were principally chosen to address the Obes Chronic Dis 2(1): 12-19. following categories: BMI, dietary habits, lifestyle, and living conditions. Copyright: © 2018 Watanabe et al. This is an Open Result: Among all participants (Males = 339, Females = 741), average BMI Access article distributed under the terms of the 2 Creative Commons Attribution 4.0 International was 22.3 ± 3.2 in males and 20.7 ± 2.8 kg/m in females. Current consumers of License (CC-BY) (http://creativecommons.org/ brown rice had a significantly lower BMI than all other categories aggregated licenses/by/4.0/) which permits commercial use, (BMI brown rice = 20.6 ± 2.0, BMI white rice = 22.3 ± 3.3; p < 0.000). They including reproduction, adaptation, and distribution reduced body weight 9 kg in males and 6 kg in females from the maximal body of the article provided the original author and weight in middle age. Brown rice eaters preferred to eat Japanese foods and source are credited. traditional vegetables, avoiding meat, dairy products and western foods. They Published by United Scientific Group disliked oily and spicy taste, and their optimal food attributes were fresh, organic, no additives, without genetically-modified foodstuff and locally-produced. Brown rice eaters had bowel movements once or twice a day, and their stools had the shape of a banana. Dietary habits contributed to their healthy feeling in conjunction with other life attitudes. Conclusion: The brown rice diet seemed to improve or prevent obesity compared with a polished white rice eating. The good bowel movement and the stool figure suggested a good intestinal environment which led to avoid obesity and kept health. Dietary habits with brown rice, rich vegetables, avoiding meat, should support the healthy life. Keywords BMI, Obesity, Brown rice diet, Lifestyle, Epidemiology, Cross sectional study Introduction A relationship between food and health have been reported by a lot of epidemiological studies. The seven countries study by Keys et al. and the planned residents-based cohort study by Takashi Hirayama are considered to open a nutritional epidemiology [1-4]. The Mediterranean Diet, DASH diet, Zone, Ornish and others were thus proposed [5-9]. There are only a few epidemiological Watanabe et al. 12 Effects of Brown Rice on Obesity: GENKI Study I (Cross Sectional Epidemiological Study) Watanabe et al. data about the health effects of the brown rice diet [10], which asked dietary habits, life habits, past history, family history, has been popular in Japan. Genmai (brown rice) diet was health awareness, etc. The foods of 116 items were adopted originally proposed by Sagen Ishizuka [11] and Kenzo Futaki by a semi-quantitative food frequency question. The dietary [12] combined with wellness fasting and the carbohydrate habits of the brown rice diet were usually matched to the restriction diet, so it is important to get a basic data of genmai recommendation of dietitian’s proverb “ma/go/wa/ya/sa/shi/i” eating people [13, 14]. which means “grand children are kind” in Japanese. “Ma” is a prefix of beans, “go” is sesame seeds and nuts, “wa” is seaweed, In the previous JPHC cohort of 140,000 people in the “ya” is vegetables, ”sa” is fishes, “shi” is shiitake and mushrooms, National Cancer Center did not distinguish a kind of rice, and “i” is yam. All these foodstuffs were included, and a and in the Saku Human Dock cohort targeting 50,000 health detailed question about brown rice and natural food intake check-up examinees, there were only several 10 people who was prepared. Eating habits, exercise habits, living conditions, had consumed brown rice, so the statistical analysis could educational background, profession and annual income, and not be possible [15-20]. There are many healthy people who for women, menstruation, childbirth, feeding history, etc. were run a brown rice vegetarian diet in the group such as Japan asked. Most questions were similar to those of JPHC cohort Society of Integrative Medicine, Japan CI Association, the study to compare the results of residential population [17]. Japan Macrobiotic Association, and the AOB KEIO Group Our PDF version can be downloaded from the address below: [21-23]. The above groups had organized the Integrated (http://www.lifescience.or.jp/genki1/questionair/). Shokuiku (eating education) Promotion Council five years ago [24]. Each group has more than a thousand members and act The questionnaire that had been sent back was stored in to distribute natural foods. a locked locker with a key ID. The abnormal value or lack of answer was confirmed to the subject, and data were stored in For this study, the authors asked to investigate the health the Excel database. effects of brown rice with a collaboration with the Research Laboratory of the Life Science Promoting Association Japan, Items of the questionnaire were as follows: and to clarify the health effects of brown rice eating. Each • Age, height, current weight, BMI, weight at 20 years old, participating group understood the importance of this study maximal weight and age in the past and supported to recruit their members to this study by the board decision. The authors sent a questionnaire to the • Staple rice, food preferences and eating habits applicants and got the informed consent to make a cross- • Dietary awareness, food intake status (SFFQ), meal sectional study, ahead of their inclusion in a forthcoming sketches cohort study for the future follow-up study and/or a nested study in the cohort population. • Lifestyle and habits The purpose of this study was to clarify the relationship • Current health condition, bowel movement, and stool between the health effects of brown rice diet and the obesity feature in which a questionnaire survey was conducted mainly for a • Health history, parents, siblings, chief complaints group of brown rice and natural foods intake. The relationship between diet and health is a field that requires more research • Changes of health condition from the last year, and for an ultra-aging society like Japan. healthy habits The Japanese cuisine has become popular worldwide • Liquor, tobacco, eating out, supplements, fasting as one of world legacies, but the evaluation of brown rice is experience left behind. It is necessary to investigate the current status • Physical activities, living way, occupations, education, by good epidemiological design to study the population of income brown rice eaters. GENKI study is an abbreviation of “Genmai Epidmiology Nutrition and Kenko (health) Innovation”, • Stress, and Life Creed (Religion) and planned to find integrated solution by accumulating • Women’s Health, menarche, menstruation, hormone use, multidimensional evidences for healthy longevity. delivery history, childcare history • Contact and free comments space Subjects and Methods • Address, e-mail, name, telephone, etc. for communication, We made public relations about the study through the if desired monthly magazine of each society, and called participation. The participants returned the application form enclosed in the magazine to the Office by fax or e-mail, and the registration Ethical Issue office confirmed the intention of participants, and sent a For this study, the steering Committee by Japan Society questionnaire. The survey was carried out from April 1, 2016 of Integrative Medicine, Japan CI Association, the Japan to March 31, 2017, and 1,100 people participated to the study. Macrobiotic Association, and the AOB KEIO Group The questionnaire form is 8 pages in A4 size and needed examined the proposed research plan and approved the about 30 minutes to 1 hour to fulfil the questionnaire. It ethics review by the Ethics Review Board of the Life Science Journal of Obesity and Chronic Diseases | Volume 2 Issue 1, 2018 13 Effects of Brown Rice on Obesity: GENKI Study I (Cross Sectional Epidemiological Study) Watanabe et al. Promoting Association (No. 003 in September 2015) [21-23]. in middle age in females figure 1. The place of residence was Collected data were all anonymized in the Excel spreadsheet for distributed from Hokkaido to Kyushu in Japan, so regional analysis, and consent forms and confidential information were bias could be neglected (data not shown). separately stored in the locked locker. Original questionnaire shall be returned to each participant with a report of the study for self-education. Statistical Analysis The information obtained from the questionnaire was used for the Excel database, and transferred to SPSS database. Non-parametric analysis was used for categorical data, and parametric analysis for continuous variables. The complete data of 1080 people were provided for analysis.