Research related to nutrition policy, including topics such as infant nutrition, dietary intake standards, dietary guidelines, information media, and poverty.

Our work aims to identify factors and propose solutions to various issues related to Japan's nutrition policy and public nutrition through research.

Related Research Achievements:

• Katagiri R, Tabuchi T, Katanoda K.Socioeconomic and sociodemographic factors associated with food expense insufficiency during the COVID-19 pandemic in Japan: . PLoS One. 17, e027926, 2022.

Epidemiological research on the relationship between food and nutrient intake and health, related to extending healthy lifespan

We analyze data to explore how various foods and nutrients are associated with longevity and disease risks, such as cancer, among Japanese people, presenting findings from multiple perspectives.

Related Research Achievements:

• Katagiri R , Goto A, Shimazu T, Yamaji T, Sawada N, Iwasaki M, Inoue M, Tsugane S; Japan Public Health Center based Prospective Study Group. Dietary fiber intake and risk of gastric cancer: The Japan Public Health Center based prospective study. Int J Cancer. 148(11):2664 2673, 2021. .
• Katagiri R , Goto A, Sawada N, Yamaji T, Iwasaki M, Noda M, Iso H, Tsugane S. Dietary fiber intake and total and cause specific mortality: the Japan Public Health Center based prospective study. Am J Clin Nutr. 111:1027 1035, 2020.
• Katagiri R , Sawada N, Goto A, Yamaji T, Iwasaki M, Noda M, Iso H, Tsugane S; Japan Public Health Center based Prospective Study Group. Association of soy and fermented soy product intake with total and cause specific mortality: prospective cohort study. BMJ. 368:m34, 2020.

Exploratory research related to cancer initiation and prevention

We conduct epidemiological research to explore potential factors associated with cancer initiation and identify strategies for cancer prevention.

Related Research Achievements:

• Katagiri R, Song M, Zhang X, Lee DH, Tabung FK, Fuchs CS, Meyerhardt JA, Nishihara R, Chan AT, Joshi AD, Iwasaki　M, Ogino S, Willett WC, Giovannucci E, Wu K. Dietary Intake of Branched Chain Amino Acids and Risk of Colorectal
  Cancer. Cancer Prev Res (Phila). 13(1):65 72, 2020.
• Katagiri R, Goto A, Nakagawa T, Nishiumi S, Kobayashi T, Hidaka A, Budhathoki S, Yamaji T, Sawada N, Shimazu T,
• Inoue M, Iwasaki M, Yoshida M, Tsugane S. Increased Levels of Branched Chain Amino Acid Associated With Increased Risk of Pancreatic Cancer in a Prospective Case Control Study of a Large Cohort. Gastroenterology.
  155(5):1474 1482.e1, 2018.

Nutritional epidemiology research on estimating nutrient intake levels

Our research focuses on estimating nutrient intake levels to determine how much of each nutrient is consumed by the Japanese population, which is necessary for setting dietary intake standards.

Related Research Achievements:

• Katagiri R, Yuan X, Kobayashi S, Sasaki S. Effect of excess iodine intake on thyroid diseases in different populations: A systematic review and meta analyses including observational studies. PLoS One.12(3):e0173722, 2017.
• Katagiri R, Asakura K, Uechi K, Masayasu S, Sasaki S. Iodine Excretion in 24 hour Urine Collection and Its Dietary Determinants in Healthy Japanese Adults. J Epidemiol. 26(12):613 621, 2016.
• Katagiri R, Asakura K, Uechi K, Masayasu S, Sasaki S. Adequacy of iodine intake in three different Japanese adult dietary patterns: a nationwide study. Nutr J. 14:129, 2015.
• Katagiri R, Asakura K, Sasaki S, Hirota N, Notsu A, Miura A, Todoriki H, Fukui M, Date C. Estimation of habitual iodine intake in Japanese adults using 16 d diet records over four seasons with a newly developed food composition database for iodine. Br J Nutr. 114(4):624 34, 2015.