Underweight has a variety of adverse physical and mental health effects, as well as a high risk of various diseases. In the present study, we conducted a literature review with the aim of extracting characteristics related to dietary habits and health and nutrition literacy of young thin women in Japan. We searched Igaku Chuo Zasshi (Ichushi, Japanese literature) and PubMed, CINAHL, Web of Science, and SCOPUS (English literature) for peer-reviewed articles published up to May 16, 2022, and finally adopted 48 articles in Japanese and 69 articles in English. The results of all the papers were classified by geographical category, even when limited in English literature, 25 articles (32.9%) were from East Asia, of which 10 articles were from Japan and 9 articles from South Korea. The results of the scoping review showed that in East Asia, including Japan, body image was the most frequently reported factor for thinness, meanwhile environmental factors were most frequently reported in the other countries. Thinness is a problem in East Asia, especially in Japan and South Korea, suggesting that thinness in these countries may be due to body image, which is not included in the three components of health.
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