J Obes Metab Syndr.  2022 Dec;31(4):345-349. 10.7570/jomes22056.

Diet Therapy Using a Small Rice Bowl among Japanese Men with Diabetes: A Randomized Controlled Trial

• Shimpo M
• Toga-Sato S
• Tosaki T

• KMID: 2537574
• DOI: http://doi.org/10.7570/jomes22056

Abstract

Background
This study aimed to investigate the effectiveness at 1 and 3 months of using a smaller rice bowl for diet therapy among Japanese men with type 2 diabetes.
Methods
A parallel-group randomized controlled trial was conducted at a medical clinic in Japan. The participants were men with type 2 diabetes mellitus, aged 20–80 years, with glycosylated hemoglobin <8.5%, and who ate rice one or more times per day at home. The intervention group (36 men) received a small rice bowl from which to eat the usual diet therapy, and the control group (38 men) received only the usual diet therapy.
Results
The changes in weight and body mass index among the intervention group at 1 month were significantly higher than those in the control group. There were no significant differences between the two groups at 3 months.
Conclusion
The effects of using a small rice bowl were minor and short-term.

Keyword

Bowl size; Nudge; Diabetes mellitus; Randomized controlled trial; Diet therapy