ObjectiveAnalysis of dietary intake among non‐obese and obese women was conducted to examine the effects of dietary intakes on bone mineral density (BMD) and obesity.MethodologyThis study was based on a sample of 29 women (15 non‐obese and 14 obese/overweight), 20 to 60 years of age. Dietary intakes were measured by Automated Self‐Administered (ASA) 24‐hour dietary recalls. Body weight and height were measured to calculate body mass index (BMI). Dual‐energy X‐ray absorptiometry (DXA) was used to measure total body BMD (TBBMD), lumbar spine BMD (L1 to L4), and dual femur BMD, as well as percent body fat.ResultsThe non‐obese group had a body mass index (BMI) between 18.5 to 24.9 kg/m2, while the obese/overweight group had a BMI ≥ 25 kg/m2 (P < 0.001). There was no significant difference between the non‐obese group and obese/overweight group with respect to age and ethnicity (P > 0.05). Average energy intake was 1864 ± 717 kilocalories (kcal) per day for the non‐obese women, and 2080 ± 775 kcal/day for the obese/overweight women (P = 0.44). Similarly, daily intake of protein, fat, carbohydrate, vitamins (A, B12, D, E, K), and minerals (calcium, magnesium, phosphorus, potassium) were similar between the non‐obese and obese/overweight groups (P > 0.05). Dietary intake could not explain the difference in BMI between groups. Both groups met the Recommended Dietary Allowances (RDA), except for vitamin D and potassium; both groups consumed about 30% to 50% less than the RDA. However, there was a significant correlation (R = 0.68, P = 0.0076) between vitamin K intake and BMD in the obese/overweight group, but not in the non‐obese group (R = 0.18, P = 0.52). The non‐obese group had a significantly lower TBBMD compared to the obese/overweight group (BMD = 1.15 ± 0.08 g/cm2 and 1.26 ± 0.12 g/cm2, respectively) (P < 0.05). Similarly, the non‐obese group had a significantly lower dual femur BMD and percent body fat (0.94 ± 0.27 g/cm2 and 29.18 ± 6.29%, respectively) compared to the obese/overweight (1.12 ± 0.12 g/cm2 and 42.16 ± 6.17%, respectively) (P < 0.05). In addition, BMI was significantly correlated with BMD (R = 0.79, P = 0.007) in the obese/overweight group, but not in the non‐obese group (R = 0.32, P = 0.23).ConclusionsWe found that the non‐obese group had a lower BMD than the obese/overweight group. In addition, BMD was significantly correlated (P < 0.05) with BMI and vitamin K intake in the obese/overweight group, but not in the non‐obese group. More research needs to be conducted to assess the effect of dietary intake and obesity on BMD in women.Support or Funding InformationThis work was supported by the American Association of University Women (www.aauw.org)'s International Post‐Doc Award to Dr. Prekshi Aggarwal.
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