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Nancy F. Krebs, MD

Professor of Pediatrics

Nancy F. Krebs, MD

Section Head, Nutrition
Chair, Department of Pediatrics Promotions Committee
Associate Affiliate, Department of Food Science & Human Nutrition, Colorado State University

   Phone: 303-724-3260

Section of Nutrition, Department of Pediatrics
Children's Hospital Colorado
Colorado School of Public Health
Department of Food Science & Human Nutrition, Colorado State University

Pediatrics, Pediatric Clinical Nutrition, Pediatric Gastroenterology

Medical Degree

  • University of Colorado School of Medicine, 1987

Master of Science

  • Nutrition Science, University of Maryland, 1979


  • Pediatrics, University of Colorado School of Medicine, 1987-1990


  • PEW National Nutrition Program, 1990-1993
  • Pediatric Nutrition and Gastroenterology, Department of Pediatrics, University of Colorado School of Medicine, 1990-1993

My primary research interest is related to trace mineral nutrition in the human, defining dietary requirements and evaluating the metabolic regulation and adaptation to different physiologic states. Populations of interest include normal infants, (especially breastfed), pregnant & lactating women, and premature infants. A major research tool uses stable isotope of trace minerals, including Zn and Fe, which we have applied in numerous low resource settings.

Current research support addresses investigations in normal infants in the U.S. and in several developing countries. Most recently I have been investigating the impact of dietary changes in infants on the intestinal microbiome and the infant immune system.

My secondary research interest is in childhood obesity. Active investigations include effects of insulin resistance during pregnancy on maternal and infant outcomes; and a community-based prevention and treatment of childhood obesity in a predominantly Hispanic population in Colorado.

I have mentored approximately 30 postdoctoral fellows and junior faculty, and over 30 predoctoral trainees. As a K-24 Career Development awardee, I am strongly committed to rigorous academic training for young investigators.

  • Member, APS, 2007-present
  • Member, American Society for Nutrition, 1990-present
  • Member, International Society for Research in Human Milk and Lactation, 1986-present
  • Invited Speaker, Institute of Medicine: Health Impacts of WIC - Planning a Research Agenda, Washington, D.C., 2010
  • Samuel J. Fomon Nutrition Award, AAP, 2010
  • Cambridge Who’s Who, 2006-2010
  • Member, SPR, 1996-2009
  • Excellence in Teaching Award, UCSOM 1993, 1996-1998, 2009
  • Co-Chair, Task Force on Obesity, AAP, 2003-2006
  • Chair, Committee on Nutrition, AAP, 2001-2005
  • Member, Committee on Nutrition, 1997-2005
  • Physician Nutrition Specialist Award, American Society of Nutrition, 1998-1999
  • Resident Research Award, AAP, 1991
  • Porter RM, Thrasher J, Krebs NF. Implementing a Pediatric Obesity Care Guideline in a Freestanding Children's Hospital to Improve Child Safety and Hospital Preparedness. J Pediatr Nurs. 2012 Jan 2. [PMID: 22178030]
  • Haemer M, Primak L, Krebs NF. Normal Childhood Nutrition and Its Disorders. In: Hay W, Levin M, Deterding R, Abzug M, editors. Current Pediatric Diagnosis and Treatment. 21st ed. New York: McGraw-Hill; 2012.
  • Hambidge KM, Sheng X, Mazariegos M, Jiang T, Garces A, Li D, Westcott J, Tshefu A, Sami N, Pasha O, Chomba E, Lokangaka A, Goco N, Manasyan A, Wright LL, Koso-Thomas M, Bose C, Goldenberg RL, Carlo WA, McClure EM, Krebs NF. Evaluation of meat as a first complementary food for breastfed infants: impact on iron intake. Nutr Rev. 2011 Nov;69 Suppl 1:S57-63. [PMID: 22043884]
  • Ruz M, Carrasco F, Rojas P, Codoceo J, Inostroza J, Basfi-fer K, Csendes A, Papapietro K, Pizarro F, Olivares M, Sian L, Westcott JL, Miller LV, Hambidge KM, Krebs NF. Zinc absorption and zinc status are reduced after Roux-en-Y gastric bypass: a randomized study using 2 supplements. Am J Clin Nutr. 2011 Oct;94(4):1004-11. [PMID: 21865332]
  • Tran CD, Katsikeros R, Manton N, Krebs NF, Hambidge KM, Butler RN, Davidson GP. Zinc homeostasis and gut function in children with celiac disease. Am J Clin Nutr. 2011 Oct;94(4):1026-32. [PMID: 21865333]
  • Krebs NF, Mazariegos M, Tshefu A, Bose C, Sami N, Chomba E, Carlo W, Goco N, Kindem M, Wright LL, Hambidge KM, Complementary Feeding Study Group. Meat consumption is associated with less stunting among toddlers in four diverse low-income settings. Food Nutr Bull. 2011 Sep;32(3):185-91. [PMID: 22073791]
  • Krebs NF. Infant feeding matters. J Pediatr. 2011 Aug;159(2):175-6. [PMID: 21592496]
  • Hambidge KM, Miller LV, Krebs NF. Physiological requirements for zinc. Int J Vitam Nutr Res. 2011 Jan;81(1):72-8. [PMID: 22002220]
  • Krebs NF, Hambidge KM, Mazariegos M, Westcott J, Goco N, Wright LL, Koso-Thomas M, Tshefu A, Bose C, Pasha O, Goldenberg R, Chomba E, Carlo W, Kindem M, Das A, Hartwell T, McClure E, Complementary Feeding Study Group. Complementary feeding: a Global Network cluster randomized controlled trial. BMC Pediatr. 2011 Jan 13;11:4. [PMID: 21232139]
  • Grummer-Strawn LM, Reinold C, Krebs NF. Use of World Health Organization and CDC growth charts for children aged 0-59 months in the United States. MMWR Recomm Rep. 2010 Sep 10;59(RR-9):1-15. [PMID: 20829749]
  • Miller LV, Sheng XY, Hambidge KM, Westcott JE, Sian L, Krebs NF. The use of dysprosium to measure endogenous zinc excretion in feces eliminates the necessity of complete fecal collections. J Nutr. 2010 Aug;140(8):1524-8. [PMID: 20573943]
  • Krebs NF, Gao D, Gralla J, Collins JS, Johnson SL. Efficacy and safety of a high protein, low carbohydrate diet for weight loss in severely obese adolescents. J Pediatr. 2010 Aug;157(2):252-8 . [PMID: 20304413]
  • Mazariegos M, Hambidge KM, Westcott JE, Solomons NW, Raboy V, Das A, Goco N, Kindem M, Wright LL, Krebs NF. Neither a zinc supplement nor phytate-reduced maize nor their combination enhance growth of 6- to 12-month-old Guatemalan infants. J Nutr. 2010 May;140(5):1041-8. [PMID: 20335626]
  • Klein JD, Sesselberg TS, Johnson MS, O'Connor KG, Cook S, Coon M, Homer C, Krebs N, Washington R. Adoption of body mass index guidelines for screening and counseling in pediatric practice. Pediatrics. 2010 Feb;125(2):265-72. [PMID: 20083518]
  • Carlo WA, Goudar SS, Jehan I, Chomba E, Tshefu A, Garces A, Parida S, Althabe F, McClure EM, Derman RJ, Goldenberg RL, Bose C, Krebs NF, Panigrahi P, Buekens P, Chakraborty H, Hartwell TD, Wright LL. Newborn-care training and perinatal mortality in developing countries. N Engl J Med. 2010 Feb 18;362(7):614-23. [PMID: 20164485]
  • Brown KH, Eagle-Stone R, Krebs NF, Peerson JM. Dietary intervention strategies to enhance zinc nutrition: Promotion and support of breastfeeding for infants and young children. In: 2nd IZiNCG Technical Document, Food and Nutrition Bulletin 30: 144-171, 2009.
  • Bunik M, Krebs NF, Beaty B, McClatchey M, Olds DL. Breastfeeding, infant weight status and WIC enrollment in the Nurse Family Partnership Program. Breastfeeding Medicine 4:145-149, 2009.
  • Ross E, Krebs NF, Shroyer AL, Dickenson, LM, Barrett PH, Johnson SL. Early growth faltering predicts longitudinal growth. Early Human Development 85:583-588, 2009. [PMID: 19608359]
  • Ruz M, Carrasco F, Rojas P, Codoceo J, Inostroza J, Rebolledo A, Basfi-fer K, Csendes A, Papapetro K, Pizarro F, Olivares M, Sian L, Westcott JE, Hambidge KM, Krebs NF. Iron absorption and iron status are reduced after Roux-en-Y gastric bypass. Am J Clin Nutr 90:527-32, 2009. [PMID: 19625680]
  • Gibson RS, Abebe Y, Stabler S, Allen RH, Westcott JE, Stoecker BJ, Krebs NF, Hambidge KM. Zinc, gravida, infection, and iron, but not Vitamin B-12 or folate status, predict hemoglobin during pregnancy in Southern Ethiopia. J Nutr 138: 581-6, 2008. [PMID: 18287370]
  • Hambidge KM, Mazariegos M, Solomons NW, Westcott JE, Lei S, Raboy V, Grunwald G, Miller LV, Sheng X, Krebs NF. Intestinal excretion of endogenous zinc in Guatemalan school children appears normal. J Nutrition 137(7):1747-1749, 2007.
  • Krebs NF. Meat as an early complementary food for Infants: Implications for macro and micronutrient intakes. In: Issues in Complementary Feeding (C Agostoni, O Brunser, eds). Nestle Nutrition Workshop Series, Pediatr Program, 60: 221-233, Nestec Ltd, Vevey/S. Karger AG, Basel, 2007.
  • Krebs NF, Hambidge KM. Complementary feeding: Clinically relevant factors affecting timing and composition. Am J Clin Nutr 85(suppl): 639S-45S, 2007. Krebs NF, Himes JH, Jacobson D, Nicklas TA, Guilday P, Styne D. Assessment of child and adolescent overweight and obesity. Pediatrics 120:S193-S228, 2007.
  • Miller LV, Krebs NF, Hambidge KM. A mathematical model of zinc absorption in humans as a function of dietary zinc and phytate. J Nutrition, 137: 135-141; 2007. [PMID: 17182814]
  • Hambidge KM, Abebe Y, Gibson RS, Westcott JE, Miller LV, Lei S, Stoecker BJ, Arbide I, Teshome A, Bailey KB, Krebs NF. Zinc absorption during late pregnancy in rural southern Ethiopia. Am J Clin Nutr 84:11-2-1106, 2006. [PMID: 17093163]
  • Krebs NF, Primak LE. Comprehensive integration of nutrition into medical training. Am J Clin Nutr 83: (suppl) 945S-950S, 2006.
  • Krebs NF, Westcott JE, Butler N, Robinson C, Bell M, Hambidge KM. Meat as a first complementary food for breastfed infants: feasibility and impact on zinc intake and status. J Pediatr Gastroenter Nutr 42:207-214, 2006. [PMID: 16456417]
  • Krebs NF, Westcott JE, Rodden DJ, Ferguson KW, Miller LV, Hambidge KM. Low exchangeable zinc pool sizes at birth in small for gestational age infants. Am J Clin Nutr 84: 1340-1343; 2006.
  • Xiaoyang S, Hambidge KM, Xi-Xiang Z, Jun-Xue N, Bailey KB, Gibson RS, Krebs NF. Major variables of zinc homeostasis in Chinese toddlers. Am J Clin Nutr, 84: 389-394; 2006. [PMID: 16895888]