Mean ± SE plasma concentrations of lactate in the nonlactating (□; n = 6) and lactating (▪; n = 6) women during fasting and refeeding. 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). BUN, blood urea nitrogen; FFA, free fatty acids; β-OH-BT, β-hydroxybutyrate.