About the Authors

Koichiro Azuma

Contributed equally to this work with: Koichiro Azuma, Tetsuya Nojiri

Roles Formal analysis, Writing – original draft

azumakx@keio.jp

Affiliations Department of Medicine, Nerima General Hospital and Institute of Healthcare Quality Improvement, Public Interest Incorporated Foundation Tokyo Healthcare Foundation, Tokyo, Japan, Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan

Tetsuya Nojiri

Contributed equally to this work with: Koichiro Azuma, Tetsuya Nojiri

Roles Conceptualization, Resources

Affiliation Oishi Kenko Incorporated, Tokyo, Japan

Motoko Kawashima

Roles Methodology, Project administration, Writing – review & editing

Affiliation Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan

Akiyoshi Hanai

Roles Data curation, Formal analysis, Methodology, Software, Validation, Visualization

Affiliation Oishi Kenko Incorporated, Tokyo, Japan

Masahiko Ayaki

Roles Methodology, Supervision, Writing – review & editing

Affiliation Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan

Kazuo Tsubota

Roles Funding acquisition, Investigation, Supervision, Writing – review & editing

Affiliations Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan, Tsubota Laboratory Inc., Tokyo, Japan

on behalf of the TRF-Japan Study Group

Membership of the TRF-Japan Study Group is listed in the Acknowledgments.

Competing Interests

The CEO and an employee of Oishi Kenko Incorporated had central roles in the conceptualization of the study (TN) and in the collection and analysis of data (AH). TN has received directors’ compensation from this company. AH has received a salary as a full-time employee of Oishi Kenko Incorporated. This does not alter our adherence to PLoS ONE policies on sharing data and materials. There are no patents, products in development or marketed products associated with this research to declare. The app was developed as a research tool; in the future, the app will be used to support users in maintaining healthier daily eating rhythms.