In a multicenter, community-based 30-year prospective cohort study in US, 1238 women from the Coronary Artery Risk Development in Young Adults (CARDIA) study of young black and white women ages 18 to 30 years without diabetes at baseline were screened for diabetes up to 7 times during 30 years after baseline (1986-2016). The study indicated a strong, graded inverse association of lactation duration with diabetes incidence.
Source: https://jamanetwork.com/journals/jamainternalmedicine/article-abstract/2668634?redirect=true