Objective: In alignment with the Japan Federation of Nutritional Sciences' resolution on the double burden of malnutrition, presented at the Tokyo Nutrition for Growth Summit 2021, this study aimed to systematically review research on the "Japanese diet" published in the Japanese Journal of Nutrition and Dietetics.

Methods: A total of 2,323 articles published from Volume 1 (1941) to Volume 80 (2022) were screened using predefined eligibility criteria. Of these, 412 articles related to the Japanese diet were included in the analysis.

Results: The most common study designs were cross-sectional (n = 236) and intervention studies (n = 169). Research participants were predominantly adolescents (n = 241) and middle-aged adults (n = 148). Food intake levels were categorized as follows: nutrients (n = 202), food groups (n = 223), dishes (n = 17), and meals (n = 67) (categories not mutually exclusive). Health and nutritional outcomes were assessed through blood biomarkers (n = 136), anthropometric and growth indices (n = 110), urinary/fecal biomarkers (n = 70), and self-reported measures (n = 68).

Conclusion: Early studies primarily examined digestion and absorption at the nutrient and food group levels, conducted by a limited number of researchers. Over time, research evolved in response to emerging public health and nutrition challenges. Japan's postwar nutritional recovery and increased longevity offer important insights for global nutrition efforts, particularly in Asia. Future research focusing on dish- and meal-level analyses may enhance strategies to address the global double burden of malnutrition.

Objective: This study aimed to summarize trends in research on children's diets and nutrition from 80 years of publications related to the "Japanese diet" in the Japanese Journal of Nutrition and Dietetics and to explore future research directions.

Methods: From the 412 eligible articles on the "Japanese diet" published between 1941 and 2022, studies focusing on children (aged 0~17 years) were identified and analyzed.

Results: Seventy-one articles were extracted. By developmental stage, 7 focused on infants, 20 on toddlers, 35 on school-age children, 17 on early adolescents, and 11 on mid-adolescents (some studies spanned multiple stages). Eight studies addressed school meals. Outcomes included nutrient and food group intake, as well as indicators of health and nutritional status. In infancy and early childhood, physical growth (height and weight) was the most frequently measured outcome. Among school-age children, key outcomes included physical growth, body composition (including obesity), and self-reported symptoms such as malnutrition and nonspecific complaints. In early and mid-adolescence, studies assessed body composition, fatigue, anemia, and bone density.

Conclusion: Most studies on children emphasized physical growth and body composition. As age increased, research expanded to include anemia and self-reported outcomes such as nonspecific complaints. In light of current issues such as childhood obesity and low weight among female adolescents, further evidence on children's diets and nutrition is needed to guide future health initiatives.

Objective: The diet of college students plays a critical role in the promotion and maintenance of lifelong health, as this population frequently makes independent dietary choices. This study aimed to synthesize research trends concerning the diet and nutrition of college students, as identified in 80 years of publications on the "Japanese diet" in the Japanese Journal of Nutrition and Dietetics.

Methods: From Volumes 1 to 80 (1941–2022) of the Japanese Journal of Nutrition and Dietetics, 412 articles previously selected by the Research Review on the "Japanese diet" were screened. Among these, studies targeting college students were identified and extracted.

Results: A total of 102 relevant articles were identified. Distribution by decade was as follows: 1940s (n = 7), 1950s (n = 7), 1960s (n = 10), 1970s (n = 10), 1980s (n = 11), 1990s (n = 17), 2000s (n = 23), 2010s (n = 14), and 2020s (n = 3). Study designs included 59 cross-sectional studies, 3 longitudinal studies, and 42 intervention studies. Most investigations on the "Japanese diet" explored associations with outcomes at the nutrient or food level. Health and nutritional status indicators included blood test results, subjective symptoms, anthropometric data (height and weight), and urine and stool analyses.

Conclusion: This study summarized research trends over eighty years in the Japanese Journal of Nutrition and Dietetics concerning the diet and nutrition of college students within the broader context of the "Japanese diet".

Objective: This study aimed to conduct a chronological review of research articles on the diet and nutrition of workers, based on 80 years of publication on the "Japanese Diet" in the Japanese Journal of Nutrition and Dietetics (JJND).

Methods: A total of 412 articles on the "Japanese Diet" published in JJND from 1941 to 2022 (Volumes 1–80) were examined. Articles focusing on workers were identified through summary tables and categorized by historical period.

Results: After excluding one article with unspecified occupation, 34 articles were reviewed. Among various periods—World War II, the postwar period, the rapid economic growth period, the stable growth period, the bubble economy, and the post-bubble period—the postwar period had the highest publication rate (1.00 reports/year). During times of food shortages, studies focused on nutritional assessments and nutrient fortification. In the post–rapid economic growth era, research emphasized countermeasures for fatigue and anemia among workers. Since the post-bubble period, the health benefits of the traditional Japanese diet have been increasingly highlighted. Following the implementation of Specific Health Checkups and Specific Health Guidance, a growing number of intervention studies have addressed nutrition education and improvements in the food environment.

Conclusions: This study's findings are expected to contribute to global efforts in promoting worker health, productivity, and economic development.

Objective: This review examines research trends related to diet and nutrition for older adults based on 80 years of publications in the Japanese Journal of Nutrition and Dietetics concerning the "Japanese diet," and discusses future directions for investigation.

Methods: Of the 412 articles referencing the "Japanese diet" published between 1941 and 2022 (Volumes 1~80), those focusing on older adults (generally aged ≥65 years) were selected.

Results: Twenty-one relevant studies were identified: two from the 1960s, six from the 1970s, two from the 1980s, five from the 2000s, five from the 2010s, and one from the 2020s. The corpus included 10 cross-sectional observational studies and 11 intervention studies. Regarding exposure, nine studies assessed nutrient-level factors, 12 examined food-level factors, and seven explored dish- or meal-level factors. While outcome measures varied, many studies aimed to prevent conditions leading to long-term care—such as stroke and fractures—and to delay age-related functional decline.

Conclusion: Research on the "Japanese diet" in older adults increased after the 1970s, aligning with Japan's demographic shift toward an aging society. Over the journal's 80-year history, the focus evolved from nutrient metabolism and stroke prevention to efforts targeting long-term care prevention in community-dwelling older adults and nutritional support in institutional settings. Ongoing research and dissemination of applied nutrition science remain critical to advancing a healthy aging society.

Objective: This study examined historical trends in dietary survey methods used in nutrition research on the "Japanese diet" by reviewing papers published in the Japanese Journal of Nutrition and Dietetics over approximately 80 years.

Methods: Of the 412 articles reviewed on the "Japanese Diet", 302 included descriptions of dietary survey methods, as identified in a summary table created by the review working group. These methods were classified into nine categories: "Dietary Records," "24-Hour Dietary Recall," "Food Frequency Questionnaire," "Diet History (including DHQ and BDHQ)," "Duplicated Method," "Observation Method," "Targeted Dietary Record Method," "Others," and "Unknown Details." The number of articles in each category was tabulated by 20-year intervals over the 80-year period.

Results: "Dietary Records" were the most frequently used method (151 articles), followed by "Diet History" (71), "Unknown Details" (23), "Food Frequency Questionnaire" (19), "Others" (14), "Observation Method" (13), "Targeted Dietary Record Method" (10), "24-Hour Dietary Recall" (5), and "Duplicated Method" (3).

Conclusion: "Dietary Records" have historically been the predominant method in studies on the "Japanese Diet" published in the Japanese Journal of Nutrition and Dietetics. However, over the past 20 years, the use of "Food Frequency Questionnaires" and "Diet History" has increased, indicating a methodological shift. Future studies should more clearly describe dietary assessment methods to enhance the quality and reproducibility of nutrition research.