Comparison of 2 weight-loss diets of different protein content on bone health: a randomized trial
American Journal of Clinical Nutrition,  Clinical Article

Jesudason D et al. – The authors determined whether an HP or high–normal–protein (HNP) weight–loss diet caused greater loss in bone mineral density (BMD) over 24 mo. High dietary protein intake during weight loss has no clinically significant effect on bone density but slows bone turnover.

Methods

  • The Weight Loss, Protein and Bone Density Study was conducted from 2008 to 2011 in 323 overweight [body mass index (BMI; (in kg/m2) >27] postmenopausal women, with a total hip BMD t score less than -2.0.
  • Subjects were randomly assigned to receive an isocaloric calcium-replete HP (≥90 g protein/d) or HNP (<80 g protein/d) weight-loss diet, with the aim of a difference of 20 g protein/d.
  • A total of 186 subjects (90 subjects in the HP group, 96 subjects in the HNP group) completed 12 mo, and 137 subjects (69 subjects in the HP group, 68 subjects in the HNP group) completed 24 mo.

Results

  • Biomarkers confirmed a difference in protein intake of 16 and 13.1 g at 12 and 24 mo, respectively.
  • Mean (±SE) weight loss was equal; HP subjects lost 7.9 ± 0.9 kg and HNP subjects lost 8.9 ± 0.9 kg at 24 mo.
  • Subjects lost 1–2% BMD annually at lumbar spine vertebrae 2–4, the forearm, the femoral neck, and hip.
  • ANCOVA showed no effect of the HP or HNP diet (P > 0.05 for diet and diet-time interactions).
  • A diet-by-time analysis showed that the HNP diet increased C-terminal telopeptide and osteocalcin (P ≤ 0.001 for each) despite hypercalciuria (P = 0.029).

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