Changes in bone density with lactation

Article Abstract:

Bone density appears to decline with extended lactation but subsequently return to normal after weaning. Of 110 women, 20 breast-fed for less than one month, 26 breast-fed for two to five months and 64 breast-fed for six months or more. Initial bone mineral density was measured in the hip and spine and compared with measurements taken six months and 12 months later. Bone mineral density declined an average of 5.1% in the spine and 4.8% in the hip among women who breast-fed for six months or more. This loss was significantly greater than that experienced by women in either of the other two groups. Among women who stopped breast-feeding six to nine months after childbirth, the average bone mineral density values returned to normal by 12 months. Among women who continued breast-feeding past nine months, the average bone mineral density was 3.5% lower than the initial value at the hip and 2% lower at the spine.

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Bone structural and metabolic changes at the end of pregnancy and lactation in rats

Article Abstract:

Pregnancy and lactation have significant effects on bone density. Researchers used dual-energy X-ray absorptiometry to study bone density changes in pregnant rats. At the end of pregnancy, bone formation decreased and bone breakdown increased, leading to a drop in bone density. Lactation also caused a decrease in bone density. However, bone density returned to normal levels after birth and lactation.

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Bone mineral density in grand multiparous women with extended lactation

Article Abstract:

Hormone changes that occur during pregnancy do not appear to adversely affect bone density or increase the risk of osteoporosis. This was the conclusion of a study of 30 women with six or more children who were breastfed for at least six months and 6 women with no children.

Hormones, Sex, Sex hormones

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