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M. G. Wagner 1 , K. Hert 1 , L. Myers 1 , J. Levine 2 , T. Heck 1 , Y. Rhee 1

E ffectiveness of Nutrition Education and Fruit and Vegetable Consumption on Changes in Biomarkers of Inflammation and Oxidative Stress among Overweight and Obese Adults. M. G. Wagner 1 , K. Hert 1 , L. Myers 1 , J. Levine 2 , T. Heck 1 , Y. Rhee 1

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M. G. Wagner 1 , K. Hert 1 , L. Myers 1 , J. Levine 2 , T. Heck 1 , Y. Rhee 1

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  1. Effectiveness of Nutrition Education and Fruit and Vegetable Consumption on Changes in Biomarkers of Inflammation and Oxidative Stress among Overweight and Obese Adults M. G. Wagner1, K. Hert1, L. Myers1, J. Levine2, T. Heck1, Y. Rhee1 1Department of Health, Nutrition, and Exercise Sciences, North Dakota State University, Fargo, ND, 2Family Nutrition Sciences, Concordia College, Moorhead, MN

  2. Abstract • Introduction: The growing prevalence of overweight and obesity among adults is concerning because of the numerous health conditions associated with excess weight. Underlying mechanisms believed to contribute to these detrimental health outcomes are oxidative stress and inflammation. Fortunately, regulation of oxidative stress and inflammation is possible via antioxidants consumed through a diet adequate in fruits and vegetables. However, adults’ consumption of fruits and vegetables is below recommended amounts, which places them at increased risk for chronic diseases. • Purpose: This study was designed to determine the effectiveness of a community-based fruit and vegetable education program and provision of fruits and vegetables on consumption of fruits, vegetables, antioxidants, and changes in biomarkers of inflammation and oxidative stress among overweight and obese adults. • Methods: Forty-seven adults (16 men/31 women; 45.9 ± 11.8 y; body mass index 32.7 ± 7.3 kg/m2) were randomly assigned to one of three intervention groups. The control group received no intervention; the education group attended weekly nutrition education sessions; and the fruit and vegetable group attended weekly nutrition education sessions and received one serving of fruits and two servings of vegetables per day for 10 weeks. Consumption of fruits, vegetables, and antioxidants were assessed using three-day food records. • Results: Changes in consumption of fruits, vegetables, and antioxidants among participants were associated with improvements in biomarkers of inflammation and oxidative stress in those receiving education but not among control group participants. • Discussion: Adequate and varied consumption of fruits and vegetables is recommended to aid in the prevention and regulation of inflammation.

  3. Introduction Rates of overweight and obesity have reached epidemic proportions in the U.S. contributing to increased risk of chronic disease1 An underlying mechanism believed to contribute to these detrimental health outcomes is the inflammatory process2

  4. Introduction

  5. Introduction • Antioxidant systems in the body are responsible for regulating oxidative stress and subsequent inflammation3 • Because of their high antioxidant content, consumption of fruits and vegetables (FV) is widely encouraged4 • Americans, including overweight and obese adults, consume the recommended FV servings5

  6. Purpose To determine the effectiveness of a community-based fruit and vegetable education program and provision of FV on consumption of fruits, vegetables, antioxidants, and changes in biomarkers of inflammation and oxidative stress among overweight and obese adults

  7. Study protocol approved by the North Dakota State University Institutional Review Board Participants 47 adults Inclusion Age over 18 years BMI > 25 kg/m2 Methods • Exclusion • History of bariatric surgery • Current smoker • Pregnant

  8. Methods • Data Collection • Demographics • Dietary Intake • 3-day Food Record • Laboratory Assessments • Fasting Blood Draw • Thiobarbituric acid reactive substances • Tumor necrosis factor-alpha • C-reactive protein • Study Duration • Pre-testing • 2 weeks • Intervention • 10 weeks • Post-testing • 2 weeks

  9. Methods

  10. Methods Statistical Analysis PASW version 18.0 (SPSS Inc., Chicago, IL) Alpha level < .05 Descriptive statistics T tests Pearson correlation Analysis of variance

  11. Demographics Control Education FV Gender Female 5 6 5 Male 3 9 19 Age (y) 42.1 ± 14.2 47.7 ± 10.7 46.0 ± 11.9 BMI (kg/m2) 33.0 ± 11.1 32.5 ± 6.0 32.7 ± 7.1

  12. FruitConsumption * * *Significant difference in mean servings consumed per day from pre-test to post-test

  13. Vegetable Consumption

  14. Beta Carotene Consumption ^ ^Trend toward a significant difference in consumption from pre-test to post-test

  15. Vitamin C Consumption

  16. Vitamin E Consumption

  17. Selenium Consumption

  18. Thiobarbituric Acid Reactive Substances ^ ^Trend toward a significant difference in consumption from pre-test to post-test

  19. C-Reactive Protein ^ ^Trend toward a significant difference in consumption from pre-test to post-test

  20. Discussion Supplementation was effective at increasing FV consumption. This is the first study to examine effects of FV supplementation on consumption patterns of overweight and obese adults. Decreases in oxidative stress and inflammatory biomarkers were greatest among participants in the FV group, which suggests a possible benefit of FV supplementation on decreased inflammation.3

  21. Conclusions A limitation was that a convenience sample was used, thereby limiting the generalizability of the results. Efforts to increase consumption should focus on encouraging intake of a variety of FV, particularly those with the highest antioxidant content. It is also necessary to emphasize management of overall energy intake, including decreased consumption of high-energy, nutrient poor foods.

  22. References Centers for Disease Control and Prevention. Obesity and overweight. U.S. Department of Health and Human Services. Available at: http://www.cdc.gov/nchs/fastats/overwt.htm. Accessed November 17, 2011. Dowd JB, Zajacova A, Aiello AE. Predictors of inflammation in U.S. children aged 3-16 years. Am J Prev Med. 2010;39(4):314-320. Jones DP, DeLong MJ. Detoxification and protective functions of nutrients. In M. H. Stipanuk, Biochemical and Physiological Aspects of Human Nutrition (pp. 901-916). Philadelphia, PA: W.B. Saunders Company; 2000. Hansen L, Dragsted LO, Olsen A, Christensen J, Tjønneland A, Schmidt E B, Overvad K. Fruit and vegetable intake and risk of acute coronary syndrome. Br J Nutr. 2010;104:248-255. Andreyeva T, Long MW, Henderson KE, Grode GM. Trying to lose weight: Diet strategies among Americans with overweight or obesity in 1996 and 2003. J Am Diet Assoc. 2010;110(4): 535-542.

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