title: Dietary supplement users vary in attitudes and sources of dietary supplement information in East and West geographic regions: a cross-sectional study.
abstract: BACKGROUND
  Over 50% of adults currently use dietary supplements (DS) but manufacturers do not have to prove the safety or efficacy of a DS before it is marketed. Therefore, consumers may be exposed to inaccurate DS information, may lack confidence in choosing appropriate DS and may seek advice for usage. The objective of this study was to examine trends in usage, attitudes, and sources of information regarding DS according to geographic location, demographic group, and lifestyle choices.
  
  
  METHODS
  Eligible individuals completed a 10-item researcher-developed survey tool to determine DS use, sources of DS information, and DS-related knowledge and attitudes over the previous year. Healthy participants (637 individuals aged 21-75 years) from two population-based cohorts that had been recruited for lipoprotein assessment studies at Tufts University in Boston, Massachusetts and University of California at Davis. Outcome measures included participants' use, beliefs regarding essentiality of DS, confidence in choosing appropriate DS, and sources of information on DS. Univariate and multivariate logistic regression were utilized to examine differences in survey responses between groups.
  
  
  RESULTS
  Of the total population 72.7% reported taking dietary supplements in the previous year. Those living on the West Coast (80.3%) had greater use than those living on the East Coast (60.7%). Those on the East Coast were more likely to believe DS were essential to health (48.7%) and to feel confident in choosing DS that were appropriate for them (51.0%). Overall, physicians were the most frequent source of DS information for more than 50% of participants on both coasts.
  
  
  CONCLUSIONS
  Because DS usage is widespread, health care providers and nutrition educators must encourage patients to discuss their DS use and be equipped to provide information conducive to safe, efficacious consumption. Tailoring interventions for healthcare providers, media sources, industry, and the public may allow for dissemination of up-to-date information regarding DS.
authors.forename: Mary R
authors.initials: MR
authors.lastname: Rozga
authors.forename: Judith S
authors.initials: JS
authors.lastname: Stern
authors.forename: Kimber
authors.initials: K
authors.lastname: Stanhope
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Havel
authors.forename: Alexandra G
authors.initials: AG
authors.lastname: Kazaks
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D019587:Dietary Supplements / Q000706:statistics & numerical data*; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008019:Life Style; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D010820:Physicians; D011795:Surveys and Questionnaires; D014481:United States
references.citation: Soc Sci Med. 2001 Feb;52(4):621-33
references.pmid: 11206658
references.citation: Mayo Clin Proc. 2001 Jul;76(7):688-94
references.pmid: 11444400
references.citation: Altern Ther Health Med. 2004 Nov-Dec;10(6):50-5
references.pmid: 15624349
references.citation: J Am Diet Assoc. 2006 Feb;106(2):227-37
references.pmid: 16442871
references.citation: Clin Ther. 2011 Nov;33(11):1749-58
references.pmid: 22030445
references.citation: Med Sci Sports Exerc. 2013 Jan;45(1):23-8
references.pmid: 22811037
references.citation: J Holist Nurs. 2008 Mar;26(1):27-35; quiz, 38-40
references.pmid: 18332357
references.citation: J Am Osteopath Assoc. 2007 Jan;107(1):13-20; quiz 21-3
references.pmid: 17299031
references.citation: Ann Fam Med. 2009 Mar-Apr;7(2):139-47
references.pmid: 19273869
references.citation: J Altern Complement Med. 2008 Dec;14(10):1263-9
references.pmid: 19032071
references.citation: J Altern Complement Med. 2009 Jun;15(6):673-80
references.pmid: 19489706
references.citation: J Nutr. 2011 Feb;141(2):261-6
references.pmid: 21178089
references.citation: J Am Board Fam Pract. 1998 May-Jun;11(3):193-9
references.pmid: 9625510
references.citation: BMC Complement Altern Med. 2006 Apr 28;6:15
references.pmid: 16646964
references.citation: Altern Ther Health Med. 2003 May-Jun;9(3):42-9
references.pmid: 12776474
references.citation: NCHS Data Brief. 2011 Apr;(61):1-8
references.pmid: 21592424