LEP and obesity due to melanocortin 4 receptor deficiency: Leptin was associated with pre-pregnancy BMI class (obesity β = 0.227, p = 0.046), and markers of body composition, namely thigh circumference (β = 0.278, p = 0.017) and upper arm fat area (β = 0.212, p = 0.060); diet quality had no impact on leptin.