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1.
  • Alsharari, Zayed, et al. (författare)
  • Association between carbohydrate intake and fatty acids in the de novo lipogenic pathwayin serum phospholipids and adipose tissue among 63-year old men
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • AbstractBackground: Fatty acid composition in blood and adipose tissue is useful to reflect dietary fatquality, although the utility of even-chain saturated fatty acids (SFA) and monounsaturated fatty acids (MUFA) has been debated. Since SFA also can be produced via de novo lipogenesis (DNL), and desaturated to MUFA, it has been proposed that these fatty acids may reflect carbohydrate-induced DNL. We aimed to test the hypothesis that high carbohydrate intake, especially sugars, is related to SFA and MUFA in serum and adipose tissue.Methods: Validated 7-day food records were collected and fatty acid composition in serum phospholipids (PL) and adipose tissue (AT) were measured in 63-year-old men (n=299). Stearoyl-CoA desaturate (SCD) activities in AT and PL were estimated by the palmitoleic acid (16:1) to palmitic acid (16:0) ratio. Associations of dietary carbohydrate, disaccharides,  monosaccharides, carbohydrate-to-fiber ratio, and alcohol with the sum of even-chain SFA, 16:0, 16:1, and SCD activity were assessed using linear regression models with and without adjustment for BMI. Non-linear trends were evaluated using restricted cubic splines. In a subsample (n=81) with RNA measured in AT biopsies, associations of dietary carbohydrate and alcohol with SCD gene expression were assessed using linear regression models.Results: In BMI-adjusted models, intake of carbohydrates was inversely associated with palmitic acid in PL (P=0.005). Disaccharide intake was non-linearly associated with 16:1 and SCD activity in PL (P for nonlinear trend ≤0.02), with the lowest values observed in the mid tertile. Alcohol intake was linearly associated with 16:0 in PL (P<0.001) and with 16:1 (P<0.001) and SCD activity (P ≤0.005) in AT. Alcohol intake was non-linear associated (P≤0.02) with 16:1 and SCD activity in PL; with initially stable levels at lower intakes that rapidly increased at intakes above median. In the subsample, we found no associations between carbohydrate intake and SCD gene expression (P ≥0.08).Conclusion: In this Swedish population, we found no evidence to suggest that higher carbohydrate intake or sugar-rich foods or beverages is reflected by higher SFA in PL and AT.Instead, alcohol was consistently associated with higher SFA and MUFA.
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2.
  • Alsharari, Zayed, et al. (författare)
  • CarbohydrateIntake and Abdominal Obesity in Swedish Men
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • ABSTRACTBackground/Objectives: Associations between carbohydrates, particularly simple sugar and starch, and abdominal anthropometric measures appears controversial. However, the role of dietary carbohydrate intake in obesity and abdominal obesity has been debated, and few studies have been conducted in Nordic populations. We aim to examine the associations between carbohydrate quantity and quality, and anthropometric measures in Swedish men.Subjects/Methods: A cross-sectional investigation of 301 63-year-old men was conducted. Six men were excluded due to missing data on dietary intake and anthropometric measures, leaving 295 men for the present study. Healthy men were recruited from the Swedish 60YO cohort of men and women who had a health screening between 1997 to 1999. Carbohydrate and alcohol intake were assessed by a 7-days food record. The examination included anthropometric measurements (e. g., weight, BMI, WC, WHR, and SAD), fasting blood samples, and a comprehensive questionnaire. Spearman rank correlation and linear regression models were performed to assess relations between dietary intakes and anthropometric measures. Intakes of macronutrients were energy-adjusted according to the residual method. Logistic regression models were used to calculate odds ratios (OR) and 95% CI for abdominal obesity per intake tertiles.Results: Intakes of carbohydrate, monosaccharide, fibers, and fruits and vegetables correlated negatively with anthropometric measures of overall obesity (BMI) and AO (WC, WHR, and SAD). Total carbohydrate intake was significantly inversely associated with WHR and SAD. Likewise, monosaccharide intake was significantly associated with lower BMI, WC, WHR, and SAD. In contrast, alcohol intake was significantly associated with weight, BMI, WC, and SAD (Table 4). Alcohol intake was associated with AO (P for linear trend 0.002). Men in the highest tertile of alcohol intake were almost three times as likely to have AO compared to the men in the lowest tertile of intake, OR (95% CI): 2.93 (1.40-6.16). There was no evidence of non-linear association between the macronutrients and AO.Conclusion: In this Swedish population of older men, higher intakes of total carbohydrates and monosaccharides were associated a more favorable body fat distribution and lower abdominal adiposity. Men with higher alcohol intake were more likely to have AO as compared with a lower intake.
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3.
  • Alsharari, Zayed, et al. (författare)
  • Comparison of a 21-item food questionnaire with a 7-day dietary registration andbiomarkers of fat intake in a Swedish cohort of 60-year-old adults.
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • AbstractPurpose. To evaluate a 21-item food frequency questionnaire (FFQ) in men participating in alarge cohort of Swedish 60-year-old adults (60YO).Methods. A self-reported FFQ (including 21 qualitative and semi-quantitative questions) was completed by >2000 men as part of a detailed baseline examination. A subsample of 301 men was included in a subsequent study in which detailed dietary habits were determined by a 7-day food record. Spearman rank correlations (r) and weighted Kappa (Kw) statistics were used to compare food intake categories in FFQ and 7-day food record. Furthermore, fatty acid (FA) composition in serum cholesteryl esters, assessed concurrent with the FFQ completion, was used to evaluate intakes of specific fat-rich foods from the FFQ.Results. We found good agreement between FFQ and food records for the reported intake ofalcohol (r=0.72, Kw=0.51), margarine (r=0.60, Kw=0.33), and fruit (r=0.49, Kw=0.31), reasonably good agreement for total fish (r=0.25, Kw=0.23), and egg (r=0.35, Kw=0.28), but poor agreement for other food groups such as bread, cheese, vegetables and cookies. In addition, serum proportions of long-chain n-3 polyunsaturated FAs and pentadecanoic acid were significantly higher in men with greater intakes of fish and cheese, respectively.Conclusion. In this evaluation of a short FFQ against 7-d food records and serum biomarkers of fat intake we found that the FFQ reasonably well reflected the intake of certain food groups (e.g. alcohol, fish, and margarine), but performed less accurate for other food groups. Firm and overallconclusions on validity are confined by the time-lag between the test and the reference method.
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