Tianyi Huang1, Deirdre K Tobias2, Adela Hruby3, Nader Rifai4, Shelley S Tworoger5, Frank B Hu6. 1. Channing Division of Network Medicine, Department of Medicine, tih541@mail.harvard.edu. 2. Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA; 3. Nutritional Epidemiology Program, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA; 4. Division of Laboratory Medicine, Boston Children's Hospital, Boston, MA; and. 5. Channing Division of Network Medicine, Department of Medicine, Departments of Epidemiology and. 6. Channing Division of Network Medicine, Department of Medicine, Departments of Epidemiology and Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA.
Abstract
BACKGROUND: The associations between long-term dietary quality and biomarkers of the brain-adipose axis have not been examined. OBJECTIVE: We evaluated both cross-sectional and longitudinal associations between dietary quality and several biomarkers involved in the brain-adipose axis. METHODS: In the Nurses' Health Study II, 831 women [baseline mean age: 45 y; body mass index (BMI; in kg/m(2)): 24.6] were randomly selected from women who provided 2 fasting blood samples in 1996-1999 and 2010-2011 to measure plasma concentrations of leptin, soluble leptin receptor (sOB-R), adiponectin, insulin, retinol binding protein-4 (RBP-4), interleukin-6 (IL-6), and C-reactive protein (CRP). Dietary quality was assessed by the Alternative Healthy Eating Index (AHEI-2010) with the use of semiquantitative food-frequency questionnaires administered in 1995 and 2011. We used linear mixed models to evaluate the cross-sectional associations between dietary quality and biomarker concentrations. We also examined change in dietary quality in relation to change in biomarker concentrations. RESULTS: In cross-sectional analyses that compared the highest with the lowest quintile of AHEI-2010, we observed significantly lower leptin (P-trend < 0.0001), insulin (P-trend < 0.0001), and CRP (P-trend = 0.02) and significantly higher sOB-R (P-trend < 0.0001) and adiponectin (P-trend = 0.0003). These associations, except for CRP, remained significant after adjustment for BMI. In longitudinal analyses, women in the highest quintile of AHEI-2010 score change (most improvement) had a 13% increase in leptin, compared with a 42% increase (P-trend < 0.0001) in the lowest quintile (least improvement). The corresponding multivariable-adjusted percentage changes for other biomarkers were 4% compared with -1% for sOB-R (P-trend = 0.04), 14% compared with 6% for adiponectin (P-trend = 0.02), and -11% compared with 16% for CRP (P-trend = 0.02). Adjustment for interim weight change attenuated these associations. No associations were observed for RBP-4 or IL-6. CONCLUSION: Improvement in dietary quality was associated with favorable profiles of several biomarkers of the brain-adipose axis in women.
BACKGROUND: The associations between long-term dietary quality and biomarkers of the brain-adipose axis have not been examined. OBJECTIVE: We evaluated both cross-sectional and longitudinal associations between dietary quality and several biomarkers involved in the brain-adipose axis. METHODS: In the Nurses' Health Study II, 831 women [baseline mean age: 45 y; body mass index (BMI; in kg/m(2)): 24.6] were randomly selected from women who provided 2 fasting blood samples in 1996-1999 and 2010-2011 to measure plasma concentrations of leptin, soluble leptin receptor (sOB-R), adiponectin, insulin, retinol binding protein-4 (RBP-4), interleukin-6 (IL-6), and C-reactive protein (CRP). Dietary quality was assessed by the Alternative Healthy Eating Index (AHEI-2010) with the use of semiquantitative food-frequency questionnaires administered in 1995 and 2011. We used linear mixed models to evaluate the cross-sectional associations between dietary quality and biomarker concentrations. We also examined change in dietary quality in relation to change in biomarker concentrations. RESULTS: In cross-sectional analyses that compared the highest with the lowest quintile of AHEI-2010, we observed significantly lower leptin (P-trend < 0.0001), insulin (P-trend < 0.0001), and CRP (P-trend = 0.02) and significantly higher sOB-R (P-trend < 0.0001) and adiponectin (P-trend = 0.0003). These associations, except for CRP, remained significant after adjustment for BMI. In longitudinal analyses, women in the highest quintile of AHEI-2010 score change (most improvement) had a 13% increase in leptin, compared with a 42% increase (P-trend < 0.0001) in the lowest quintile (least improvement). The corresponding multivariable-adjusted percentage changes for other biomarkers were 4% compared with -1% for sOB-R (P-trend = 0.04), 14% compared with 6% for adiponectin (P-trend = 0.02), and -11% compared with 16% for CRP (P-trend = 0.02). Adjustment for interim weight change attenuated these associations. No associations were observed for RBP-4 or IL-6. CONCLUSION: Improvement in dietary quality was associated with favorable profiles of several biomarkers of the brain-adipose axis in women.
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