Mean ± SE concentrations of plasma glucose, insulin, C-peptide, and glucagon in the nonlactating (□; n = 6) and lactating (▪; n = 6) women during the fasting (left) and refeeding (right) states. Statistics were carried out using repeated-measures ANOVA denoting differences over time (A), differences between groups (B), and difference due to interaction of group and time (AB).