They reported that a larger ΔPRL (associated with a larger breast size increase across pregnancy) was associated with a lower maternal BMI and that women with a ΔPRL above the median had a more favourable metabolic profile at 32 weeks gestation (lower fasting glucose, lower fasting insulin, and a lower homeostatic model assessment of insulin resistance, HOMA-IR) compared with women with a ΔPRL below the median. Here, INS is linked to Insulin resistance.