Abstract P080: Dietary Protein, Especially Meat Protein, is Positively Associated with Bone Stiffness Index in Population Consuming Relatively Low Amounts of Protein
Introduction: Dietary protein has a mixed effect on bone health, and it may differ by amount or source. The majority of epidemiological and clinical studies have demonstrated that dietary protein has a positive association with bone health. However, most studies, so far, have been performed in women and in people with moderate- to high-protein diet. Little is known about relationship between dietary protein and bone health in men and in people who consume relatively low amounts of protein.
Hypothesis: Since Korean traditional meals depend heavily on carbohydrate, Korean rural residents consume protein, especially animal protein, at relatively low levels compared with that in the Western diets. Therefore, we assessed whether protein intake is beneficial for the people who consume relatively low amounts of protein.
Methods: Participants were recruited for a baseline examination of a community-based cohort study in Kangwha, which consist of ten islands with rural villages and a small town on the west coast of South Korea. Among 3,330 participants recruited for a baseline examination between 2008 and 2010,1,182 men and 1,393 postmenopausal women were eligible for the present analyses. Diet was assessed over a 1-year period using a 103-item semi-quantitative food-frequency questionnaire developed for Korean adults. Bone density, measured at the os calcis with a quantitative ultrasound device, was expressed as the stiffness index (SI). A series of analysis of covariance was performed to calculate the adjusted mean SI across sex-specific tertiles of protein intake and their linear trends using a generalized linear model procedure. Total energy intake, age, weight, current smoking status (men only), current hormone therapy (women only), and moderate to high intensity of exercise were potential confounders.
Results: In the present study population, the median daily protein intake was 50.5 g in men and 44.0 g in women. In men, the multivariate-adjusted mean SI showed an increasing trend with a higher total protein intake (P for trend = 0.041). Among various sources of protein, only meat protein was positively associated with the SI (P for trend = 0.009). Meanwhile, in postmenopausal women, neither total protein nor any protein subtype showed a significant association with the SI.
Conclusions: Our findings suggest that total protein, especially meat protein, contributes bone health in men who consume relatively low amounts of protein. Further research is needed to evaluate long-term effects of protein on bone health in this population.
- © 2012 by American Heart Association, Inc.