Related Experiment Videos
Obesity as a protective factor for postmenopausal osteoporosis
1Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile.
Summary
Obesity is linked to higher bone mineral density (BMD) in postmenopausal women, offering protection against osteoporosis. This effect may be due to lower sex hormone-binding globulin (SHBG) and higher insulin levels in obese individuals.
Area of Science:
- Endocrinology
- Bone Metabolism
- Menopause Research
Background:
- Obesity is recognized as a potential protective factor against osteoporosis.
- It is associated with improved bone mass and sustained estrogen levels during menopause.
Purpose of the Study:
- To investigate the association between obesity and bone mineral density (BMD).
- To explore the relationship between obesity, BMD, and sex hormone levels in postmenopausal women.
Main Methods:
- A case-control study involving 113 obese and 50 non-obese Caucasian postmenopausal women.
- Bone mineral density (BMD) was measured using dual-photon X-ray absorptiometry at multiple skeletal sites.
- Plasma levels of glucose, insulin, total estrogen, FSH, SHBG, DHA-S, and testosterone were analyzed.
Main Results:
- Obese women exhibited significantly higher mean BMD at the femoral neck, Ward's triangle, and lumbar spine compared to non-obese women.
- Obesity was associated with a reduced risk of osteopenia at the femoral neck and lumbar spine.
- Obese women had lower sex hormone-binding globulin (SHBG) and higher postglucose load insulin levels.
Conclusions:
- The study confirms that obesity is associated with higher BMD, suggesting a protective effect against osteoporosis.
- This protective effect may be mediated by decreased SHBG levels, leading to increased free sex steroids.
- Hyperinsulinemia in obese women might also contribute to increased insulin-like growth factor (IGF-1), potentially stimulating osteoblast proliferation.