INS and hyperlipidemia: Animal models suggested that blood glucose and insulin levels were reduced by 20% and 35% in lactating rats, respectively.28 Breastfeeding has been inversely associated with impaired insulin sensitivity and glucose tolerance in postmenopausal women.11,12 Breastfeeding has a beneficial effect on hyperlipidemia, visceral fat, and central obesity.14 In addition, among women with exclusive breastfeeding, a longer breastfeeding history might prevent peripheral nerve aging by slowing the return of ovulation after delivery and reproductive aging.29