The relationship between central obesity and bone mineral density: a Mendelian randomization study

Area of Science:

• Genetics
• Public Health
• Metabolic Disorders

Background:

• Obesity and osteoporosis represent significant public health challenges.
• Understanding the link between central obesity and bone mineral density (BMD) is crucial.

Purpose of the Study:

• To investigate the causal effects of central obesity traits on BMD.
• To determine the extent to which specific obesity indicators influence bone health.

Main Methods:

• A two-sample Mendelian randomization analysis was employed.
• Genetic variants associated with waist circumference, hip circumference, and waist-to-hip ratio (and their BMI-adjusted counterparts) were utilized.
• Summary statistics from large-scale genetic databases (224,459 samples) and the UK Biobank (265,627 participants) for BMD were analyzed.

Main Results:

• Hip circumference adjusted for BMI (HCadjBMI) showed a significant negative causal association with BMD (β: -0.135, P=0.001).
• Waist-to-hip ratio (WHR) demonstrated a significant positive causal association with BMD (β: 0.194, P=0.004).
• No significant causal effects were found for other central obesity traits on BMD.

Conclusions:

• Different central obesity traits exert varying influences on BMD.
• Findings suggest distinct pathways linking specific obesity measures to bone health.
• Results have implications for targeted public health strategies in preventing both obesity and osteoporosis.