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Carol Johnston

Professor, Nutrition and Health Promotion


 (602) 496-2539


  • PhD Biological Sciences, The University of Texas, Austin, 1986
  • MS Nutrition, The University of Texas, Austin, 1983
  • BS Nutrition, University of Michigan, Ann Arbor, 1979


Carol S. Johnston is Professor and Associate Director of the Nutrition Program in the School of Nutrition and Health Promotion at Arizona State University.  She received her BS in nutrition from the University of Michigan, Ann Arbor and her MS in nutrition and PhD in biological sciences from the University of Texas, Austin.  She teaches both undergraduate and graduate courses and has an active research program.  She has published over 100 research articles and book chapters, and she is often quoted in popular magazines reporting nutrition news.  She is an expert in vitamin C metabolism, the medicinal use of vinegar, high protein/low carbohydrate diets for weight loss, and vegetarian diets.  She currently chairs the Institutional Review Board at ASU which oversees human subject research at the University.  She holds an elected position on an Expert Committee of the U.S. Pharmacopoeia in Washington DC.  She has been recognized on multiple occasions for her teaching excellence at ASU, and she has received several national awards from the American College of Nutrition for her professional and academic accomplishments.

Research Interests

Vitamin C metabolism, diabetic diets, obesity, and vegetarian nutrition. Specific topics include the role of vitamin C nutrition in fat oxidation, adiposity risk, and physical activity; the impact of vinegar ingestion in managing the diabetic condition; the relationships between food and mental health; and nutrient requirements of vegetarians.

Research Activity

  • Tasevska,Natasha*Johnston,Carol S. Investigation of Biomarkers for Sugars Intake A Controlled Feeding Study. HHS-NIH-NCI(7/1/2015 - 6/30/2020).
  • Johnston,Carol S*. The Effects of Re-Engineered Carbohydrates on Metabolic Syndrome (ASUF 30006283). ASU FDN(8/4/2014 - 2/29/2016).
  • Sweazea,Karen Leanna*Johnston,Carol S. Evaluation of the Anti-aging Properties of Product B. (8/1/2013 - 11/30/2014).
  • Sweazea,Karen Leanna*Johnston,Carol S. Almond Ingestion to Reduce Hemoglobin A1C in Individuals with Type 2 Diabetes. Almond Board of CA(7/1/2012 - 12/31/2013).
  • Johnston,Carol S*. Effects of Peanut Products on Satiety and Weight Management in an Overweight Campus Community. Peanut Inst(12/1/2010 - 11/30/2011).
  • Martin,Keith Robert*Johnston,Carol S. Effect of a polysaccharide supplement with Aloe on the bioavailability of dietary antioxidants in healthy adults. (2/7/2010 - 12/31/2011).
  • Winham,Donna M*Hutchins,Andrea MayJohnston,Carol S. Impact of Daily Navy Bean Consumption on Biomarkers for Heart Disease and Type 2 Diabetes Risk. Bush Brothers(8/1/2005 - 9/30/2006).
  • Johnston,Carol S*Swan,Pamela D. The Impact of Vitamin C Status on Fat Oxidation, Adiponectin Concentrations, and Body Mass. GENL MILLS/BELL INST OF HEALTH(5/1/2005 - 4/30/2006).
  • Hutchins,Andrea May*Johnston,Carol S. The Role of Insulin Sensitivity in the Success of Weight Loss Diets. PFEIFFER RESEARCH FDN(8/1/2004 - 7/31/2005).
  • Johnston,Carol S*. Evaluation of the Efficacy and Healthfulness of Two Popular Low Carbohydrate Diets - Atkins versus the Zone. INFLAMMATION RESEARCH FDN(8/1/2004 - 7/31/2005).
  • Winham,Donna M*Hutchins,Andrea MayJohnston,Carol S. Impact of Long-Term Chickpea Consumption on Biomarkers for Heat Disease and Type 2 Diabetes Risk. MICHIGAN STATE UNIV(6/1/2004 - 5/31/2006).
  • Johnston,Carol S*. ESTER C. GRANT: VITAMIN C METABOLISM. INTER-CAL CORP, INC(8/15/1991 - 2/29/1992).