Tadahiro Ohtsu

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Previous in vitro and animal experiments have shown that sulforaphane, which is abundant in broccoli, inhibits Helicobacter pylori (H. pylori) infection and blocks gastric tumor formation. This suggests that broccoli consumption prevents chronic atrophic gastritis (CAG) introduced by H. pylori infection and, therefore, gastric cancer. For an epidemiological(More)
Fetoplacental function and maternal nutritional condition were assessed in order to clarify the mechanism of retarded fetal growth in pregnant women who smoked. Dehydroepiandrosterone sulfate (DHA-S) loading tests and measurements of cotinine, which is a major metabolite of nicotine, were also made. In heavy smokers, urinary estriol and serum levels of(More)
BACKGROUND Although the correlation coefficient between body mass index (BMI) and percent body fat (%BF) or waist circumference (WC) has been reported, studies conducted among population-based schoolchildren to date have been limited in Japan, where %BF and WC are not usually measured in annual health examinations at elementary schools or junior high(More)
OBJECTIVE The objective of this study was to clarify the prevalence of nightmares and sleep paralysis and associated factors among Japanese adolescents. METHODS This study was designed as a cross-sectional sampling survey. The targets were junior and senior high schools throughout Japan. Self-reported anonymous questionnaires were sent to schools for all(More)
We examined the distribution of physical activity among different occupations in Japan. A questionnaire was sent to full-time employees at nine companies in Japan between 1996 and 1998, with an average response rate of 85.2%. Data from 20,654 respondents (17,637 male and 3017 female) were analyzed. We classified the occupations into eight groups according(More)
BACKGROUND Although several studies have investigated the relationship between the number of siblings or birth order and childhood overweight, the results are inconsistent. In addition, little is known about the impact of having older or younger siblings on overweight among elementary schoolchildren. The present population-based study investigated the(More)
The number of suicide deaths in Japan has continued to be high, and is a pressing social problem. Although the weekly distribution of suicide deaths has been documented, no nationwide analysis has yet been conducted. In the present study, the ratios of the number of suicide deaths per day, by day of the week, and on weekdays relative to holidays were(More)
Empirical data indicative of the health conditions and medical needs of homeless persons are scarce in Japan. In this study, with the aim of contributing to the formulation of future healthcare strategies for the homeless, we conducted a self-administered questionnaire survey and interviews at a park in Shinjuku Ward, Tokyo, to clarify the living conditions(More)
BACKGROUND Distorted body image plays a significant role in the development of obesity, eating problems, and eating disorders. The aim of this study was to investigate the relationship between distorted body image and lifestyle among Japanese adolescent boys and girls. METHODS Subjects were 1731 seventh graders (age 12-13 years) from the Ina-town's junior(More)
We conducted a cohort study for 2 years to examine the causal relationship between perceived job stress and mental health. Questionnaire surveys, including a 30-item General Health Questionnaire (GHQ) and a questionnaire on perceived job stress were carried out every 6 months for 2 years. To clarify the causal relationship between job stress and mental(More)