The findings of the study revealed that there was no significant difference in body mass index on the meal test days. Similarly, no significant differences were observed for fasting plasma glucose, serum insulin, serum C-peptide, and energy metabolism before the consumption of the 3 meals. Further analysis showed that the significant heterogeneity observed between the 3 meals in the whole group came predominantly from the subjects with a body mass index over 26.3. Additionally, subjects with a body mass index over 26.3 showed significant heterogeneity in maximum C-peptide.