Regan Bailey

Educational Background

  • M.P.H, Johns Hopkins University, Public Health and Epidemiology, 2014
  • Ph.D., The Pennsylvania State University, Nutritional Sciences; Minor: Gerontology, 2007
  • M.S., The Indiana University of Pennsylvania, Food and Nutrition, 2001
  • B.S., The Pennsylvania State University, Applied Nutrition, 1998

Certificates & Licenses

  • R.D. Registered Dietitian, 2000-Present
  • C.P.H Certified in Public Health, 2015-Present


The overarching goal of her research program is to prevent or lessen the risk of chronic disease through nutrition. Dr. Bailey's specific research interests include: nutritional epidemiology; one-carbon metabolism, particularly the role of B vitamins; dietary assessment methods and measurement error; dietary patterns; dietary supplements; nutrition screening; and, nutrition and aging, particularly as it relates to reducing the risk of cognitive impairment and osteoporosis. She has considerable expertise working with the National Health and Nutrition Examination Survey. Prior to academic life, Dr. Bailey was a Nutritional Epidemiologist and Director of Career Development and Outreach at the Office of Dietary Supplements, Office of Disease Prevention at the National Institutes of Health.

Discovery Publications

Bailey RL, Looker AC, Lu Z, Fan RZ, Eicher-Miller HA, Fakhouri TH, Weaver CM, Mills JL. B-vitamin status and Bone Mineral Density and Risk of Lumbar Osteoporosis among  Older Females in the U.S. American Journal of Clinical  Nutrition, 2015;102(3):687-94

Bailey LB, Stover P, McNulty H, Fenech M, Gregory J, Mills J, Pfeiffer CM, Fazilli, Zhang M, Ueland P, Molloy A, Caudill MA, Shane B, Berry RJ, Bailey RL, Raghavan R, Raiten D. Biomarkers of Nutrition for Development (BOND) - Folate Review. Journal of Nutrition, 2015;145(7):1636S-80S.  

Taylor C, Carriquiry A, Bailey RL. Predicted shifts in serum 25-hydroxyvitamin D concentrations based on hypothetical and folate-based fortification scenarios.  Journal of Nutrition, 2015;145(7):1623-9.

Bailey RL, Black RA, West KP. The Epidemiology of Global Micronutrient Deficiency.  Annals of Nutrition and Metabolism, 2015;66 Suppl 2:22-33.

Bailey RL, van Wijngaarden J. The Role of B-vitamins in Bone Health and Disease in Older Adults. Current Osteoporosis Reports, 2015;13(4):256-61.

Nicastro HL, Bailey RL, Dodd KW. Changes in Dietary Supplement Use Assessment Methods in NHANES 2007-2010: Implications for researchers. Journal of Nutrition, 2015 Jul;145(7):1630-4.

Pfeiffer CM, Sternberg, Fazili Z, Lacher DA, Johnson CL, Yetley EA, Bailey RL, Berry RJ, Hamner H, Rader JI, Yamini E. Folate status and serum folate forms concentrations in the U.S. population in  NHANES 2011–2012. British Journal of Nutrition, 2015;113(12):1965-77. 

Bailey RL, Fakhouri TH, Park Y, Gahche JJ, Dwyer JT, Thomas PR, Gahche JJ, Miller PE, Dodd KW, Sempos CT, Murray D. Dietary Supplement Use and Cardiovascular Disease Mortality in the United States. Journal of Nutrition, 2015;145(3):572-8.

Dwyer JT, Wiemer K, Dary O, Keen CL, King JC, Miller KB, Philbert MA, Tarasuk V, Taylor CL, Gaine PC, Jarvis AB, Bailey RL. Fortification and Health: Opportunities and Challenges. Advances in Nutrition, 2015 (6):124-131.

Pfeiffer CM, Sternberg, Fazili Z, Lacher DA, Johnson CL, Yetley EA, Bailey RL. Unmetabolized folic acid is Detected in Nearly All Serum Samples from  U.S. children, adolescents and adults. Journal of Nutrition, 2015;145(3):520-31. 

Bailey RL, Saldanna L, Dwyer JT, Gahche JJ. Estimating Caffeine Intake from in Energy Drinks and Dietary Supplements in the United States. Nutrition Reviews, 2014;72(11):735.

Ford D, Hartman T,  Still C, Wood C, Mitchell D, Erickson P,  Bailey RL, Smiciklas-Wright H, Coffman D, Jensen G. Body Mass Index, Poor Diet Quality and Health Related Quality of Life are Associated with Mortality in Rural Older Adults. Journal of Nutrition in Gerontology and Geriatrics, 2014; 33(1):23-34. 

Dwyer JT, Bailey RL, Britten P, Carriquiry A, Edge MS, Miller D, Moshfegh A, Murphy MM, Woteki C. Fortification: New Findings and Implications. Nutrition Reviews, 2014; 72(2): 127-141.

Bailey RL, Durazo-Arvizu RA, Carmel R, Green R, Pfeiffer CM, Sempos CT, Yetley EA. Modeling a methylmalonic acid-derived inflection point for serum vitamin B-12 for adults in the National Health and Nutrition Examination Survey. American Journal of Clinical Nutrition. 2013; 98: 460-467.

Bailey RL, Gahche JJ, Thomas PR, Dwyer JT. Why Children use Dietary Supplements. Pediatric Research, 2013; 74(6):737-41.

Bailey RL, Gahche JJ, Miller PE, Thomas PR, Dwyer JT. Why US Adults use Dietary Supplements. JAMA Internal Medicine (formerly the Archives of Internal Medicine), 2013;173(5):355-361.

Branum AM, Bailey RL, Singer B. The Use of Dietary Supplement in Pregnancy in the United States. Journal of Nutrition, 2013; 143: 486-492.

Taylor C, Carriquiry A, Bailey RL, Sempos CT, Yetley EA. Appropriateness of the probability approach with a nutrient status biomarker to assess population inadequacy: a study using vitamin D. American Journal of Clinical Nutrition, 2012; 97: 72-78.

Bailey RL, Arab L. Nutritional Prevention of Cognitive Decline. Advances in Nutrition, 2012; 3: 732-733.

Bailey RL, Fulgoni VL, Keast DR, Dwyer J. Do Dietary Supplements Improve Micronutrient Sufficiency in Children and Adolescents? Journal of Pediatrics, 2012; 161(5):837-842.

Bailey RL, Fulgoni VL, Keast DR, Dwyer J. Examination of vitamin intakes in U.S. adults. Journal of the Academy of Nutrition and Dietetics, 2012; 112: 657-663.

Bailey RL, Fulgoni VL, Keast DR, Dwyer J. Dietary supplement use is associated with higher intakes of minerals from food sources. American Journal of Clinical Nutrition, 2011;94 (5):1376–81.

Fulgoni VL, Keast DR, Bailey RL, Dwyer J. Foods, fortificants, and supplements – Where do Americans get their nutrients? Journal of Nutrition, 2011;141(10):1847-54. 

Bailey RL, Yetley EA, Pfeiffer CM, Carmel R, Green R, Cogswell ME, Osterloh J, Kennedy-Stephenson J, Johnson CL, Picciano MF.  Monitoring of B12 Nutritional Status using Plasma Methylmalonic Acid and serum Vitamin B12. American Journal of Clinical Nutrition, 2011; 94: 552-561. 

Bailey, RL, Gahche JJ, Lentino CV, Dwyer J, Engel JS, Thomas PR, Betz JM, Sempos CT, Picciano MF.  Dietary Supplement Use in the United States - 2003-2006. Journal of Nutrition, 2011; 141: 261-266

Yetley EA, Pfeiffer CM, Phinney KW, Bailey RL, Blackmore S, Bock JL, Brody LJ, Carmel R, Curtin LR, Durazo-Arvizu RA, Eckfeld JH, Green R, Gregory JF, Hoofnagle AN, Jacobsen DW, Jacques PF, Molloy A, Massaro J, Mills JL, Nexo E, Rader J, Selhub J, Sempos C, Shane B, Stabler S, Stover P, Tamura T, Tedstone A, Thorpe S, Coates PM, Johnson CL, Picciano MF. Biomarkers of Folate Status in the National Health and Nutrition Examination Survey. American Journal of Clinical Nutrition, 2011 94: 303S- 312S. .

Bailey RL, Mills J, Gahche J, Pfeiffer C, Dodd K, Dwyer J, Yetley E, Sempos C, Picciano MF. Unmetabolized serum folic acid and its relation to folic acid intake from diet and supplements in a nationally representative sample of adults aged > 60 y in the United States. American Journal of Clinical Nutrition, 2010; 92: 383-389. 

Bailey RL, McDowell M , Dodd K, Gahche J, Dwyer J, Picciano MF. Total folate and folic acid intakes from foods and dietary supplements of US children aged 1–13 y. American  Journal of Clinical Nutrition, 2010; 92: 353-358.

Durazo-Arvizu RA, Sempos C, Luke A, Kramer H, Yetley  E, Dawson-Hughes  B, Cao G, Bailey RL, Dwyer JT, Rovner  AJ, Picciano MF. Modeling the Association between 25[OH]D and Mortality in a Representative US Population Sample. Proceedings of the Endocrine Society Meeting, 2010; 31(3):S987-988.

Bailey RL, Dodd K, Wilger J, Dwyer J, Sempos C, Picciano MF. Calcium intakes from all sources in the United States 2003-2006. Journal of Nutrition, 2010; 140: 817 - 822.

Bailey RL, Dodd K, Wilger J, Dwyer J, McDowell M, Burt VL, Radimer K, Sempos C, Picciano MF.  Total folate intake from foods and dietary supplements in the United States: 2003-2006. American Journal of Clinical Nutrition, 2010; 91: 231-237.

Bailey RL, Miller P, Mitchell D, Hartman T, Lawrence F, Sempos C, Smiciklas-Wright H. A dietary screening tool identifies nutrition risk in older adults. American Journal of Clinical Nutrition, 2009; 90: 177-183.

Bailey RL, Mitchell DC, Miller CK, Still CS, Jensen GL, Tucker KL, Smiciklas-Wright H. A dietary screening questionnaire identifies food patterns in older adults. Journal of Nutrition, 2007; 137:421-426.

Bailey RL, Mitchell DC, Miller CK, Smiciklas-Wright H.  Assessing the effect of under-reporting energy intake on dietary patterns and weight status.  Journal of the American Dietetic Association, 2007; 107: 64- 71.

Bailey RL, Davis MS, Mitchell DC, Miller CK , Lawrence  FL, Smiciklas-Wright H. Comparative strategies for using cluster analysis to assess dietary patterns in older adults. Journal of the American Dietetic Association, 2006; 106: 1194-1200.

Book Chapters

Dwyer JT, Bailey RL. Role of Fortification and Dietary Supplements In Affluent Countries: Challenges and Opportunities.  In: Food and Nutrition in an Affluent World, in Press.

Dwyer JT, Bailey RL. The Concept of Nutritional Status, Standards, and Guide for Nutrient Intakes, Eating Patterns, and Nutrition.  In:  Lifestyle Medicine: Textbook of Medicine, Exercise, Nutrition, and Health. In Press.

Eicher-Miller H, Park C, Bailey RL. Identifying Nutritional Gaps Among Americans.  In: Dietary Supplements in Health Promotion (Gallo LL, ed). New York: CRC Press, 2015.

Dissertation Title

Dissertation: Development and Validation of a Dietary Screening Tool for Older Adults
Research supported by a NIH/National Institute on Aging training grant #T32AG00048
Mentor: Helen Smiciklas-Wright, Ph.D.

Professional Memberships

  • American Public Health Association (#9963435), 2013-Present
  • Academy of Nutrition and Dietetics (#883176), 1996-Present
  • American Society for Nutrition (ASN, #15411), 2002-Present
  • The Pennsylvania State University,  Nutrition and Dietetic Alumni Society, 2007-present
  • Dannon Nutrition Alumni Association, 2011- present

Professional Service

  • Scientific Advisor, Biomarkers of Nutrition for Development (BOND) Initiative (NIH/NICHD)
    • Folate Expert Panel
    • Vitamin B-12 Expert Panel
  • Editorial Board, Frontiers in Nutrigenomics, 2011-present
  • Editorial Board, Nutrition Today, 2012-present
  • Editorial Board, Critical Reviews in Food Science and Nutrition, 2014-present
  • Member - International Life Sciences Institute, North America: Food, Nutrition & Safety Program, 2011 - 2014
  • Scientific Advisor - International Life Sciences Institute, North America: Fortification Committee, 2012-Present
  • Founding Member, Global Nutrition and Health Alliance, 2014-present


NUTR 330

Regan Bailey
Associate Professor
Faculty Associate: 
  Center on Aging and the Life Course

Office: STON 143
Address: 700 West State Street
West Lafayette, IN 47907
Phone: 765.494.2829
Fax: 765.494.0674

Department of Nutrition Science, 700 W. State Street, West Lafayette, IN 47907-2059(765) 494-8228, Fax: (765) 494-0674

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