Roger Allyn Clemens, DrPH

Title(s)Adjunct Lecturer
SchoolUSC School of Pharmacy
AddressCHP 140
Health Sciences Campus
Los Angeles CA 90089-9014
Phone+1 323 442 2124
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    More than 25 years of experience in the food industry and academia, 40 peer-reviewed publications, 70 invited medical/scientific lectures domestically and internationally, national/international leader in Institute of Food Technologists, American College of Nutrition and American Society for Nutritional Sciences

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    Collapse selected publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Evaluation of 90-day repeated dose oral toxicity of an aloe vera inner leaf gel beverage. Food Chem Toxicol. 2024 Jul; 189:114726. Hayes AW, Pressman P, Clemens R, Singer AW, Bauter MR. PMID: 38759713.
      View in: PubMed   Mentions:    Fields:    Translation:Animals
    2. Author Correction: Precision nutrition to reset virus-induced human metabolic reprogramming and dysregulation (HMRD) in long-COVID. NPJ Sci Food. 2024 May 06; 8(1):26. Naidu AS, Wang CK, Rao P, Mancini F, Clemens RA, Wirakartakusumah A, Chiu HF, Yen CH, Porretta S, Mathai I, Naidu SAG. PMID: 38710681; PMCID: PMC11074247.
      View in: PubMed   Mentions:
    3. Precision nutrition to reset virus-induced human metabolic reprogramming and dysregulation (HMRD) in long-COVID. NPJ Sci Food. 2024 Mar 30; 8(1):19. Naidu AS, Wang CK, Rao P, Mancini F, Clemens RA, Wirakartakusumah A, Chiu HF, Yen CH, Porretta S, Mathai I, Naidu SAG. PMID: 38555403; PMCID: PMC10981760.
      View in: PubMed   Mentions: 4  
    4. The absence of genotoxicity of Aloe vera beverages: A review of the literature. Food Chem Toxicol. 2023 Apr; 174:113628. Kim ST, Pressman P, Clemens R, Moore A, Hamilton R, Hayes AW. PMID: 36702364.
      View in: PubMed   Mentions: 3     Fields:    Translation:HumansAnimals
    5. Significant shifts in preclinical and clinical neurotoxicology: a review and commentary. Toxicol Mech Methods. 2023 Mar; 33(3):173-182. Pressman P, Clemens R, Hayes AW. PMID: 35920262.
      View in: PubMed   Mentions: 1     Fields:    Translation:HumansCells
    6. SARS-CoV-2 Infection Dysregulates Host Iron (Fe)-Redox Homeostasis (Fe-R-H): Role of Fe-Redox Regulators, Ferroptosis Inhibitors, Anticoagulants, and Iron-Chelators in COVID-19 Control. J Diet Suppl. 2023; 20(2):312-371. Naidu SAG, Clemens RA, Naidu AS. PMID: 35603834.
      View in: PubMed   Mentions: 14     Fields:    Translation:HumansCells
    7. A Call for Perspective and Precision in Research Design and Conclusions Drawn From Preclinical Data. Am J Clin Oncol. 2022 03 01; 45(3):134-135. Pressman P, Clemens RA, Hayes AW. PMID: 35195563; PMCID: PMC8876414.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    8. The absence of genotoxicity of a mixture of aloin A and B and a commercial aloe gel beverage. Toxicol Mech Methods. 2022 Jun; 32(5):385-394. Hayes AW, Clemens RA, Pressman P. PMID: 34979868.
      View in: PubMed   Mentions: 3     Fields:    Translation:Animals
    9. Plant-Derived Natural Non-Nucleoside Analog Inhibitors (NNAIs) against RNA-Dependent RNA Polymerase Complex (nsp7/nsp8/nsp12) of SARS-CoV-2. J Diet Suppl. 2023; 20(2):254-283. Naidu SAG, Mustafa G, Clemens RA, Naidu AS. PMID: 34850656.
      View in: PubMed   Mentions: 11     Fields:    Translation:HumansCellsPHPublic Health
    10. Phytonutrient Inhibitors of SARS-CoV-2/NSP5-Encoded Main Protease (Mpro) Autocleavage Enzyme Critical for COVID-19 Pathogenesis. J Diet Suppl. 2023; 20(2):284-311. Naidu SAG, Tripathi YB, Shree P, Clemens RA, Naidu AS. PMID: 34821532.
      View in: PubMed   Mentions: 3     Fields:    Translation:HumansCells
    11. Bruce Nathan Ames - Paradigm shifts inside the cancer research revolution. Mutat Res Rev Mutat Res. 2021 Jan-Jun; 787:108363. Smith CJ, Perfetti TA, Berry SC, Brash DE, Bus J, Calabrese E, Clemens RA, Fowle JRJ, Greim H, MacGregor JT, Maronpot R, Pressman P, Zeiger E, Hayes AW. PMID: 34083041.
      View in: PubMed   Mentions: 2     Fields:    Translation:HumansAnimals
    12. Dietary γ-Glutamylcysteine: Its Impact on Glutathione Status and Potential Health Outcomes. J Diet Suppl. 2022; 19(2):259-270. Pressman Md P, Bridge WJ, Zarka MH, Hayes AW, Clemens R. PMID: 33307893.
      View in: PubMed   Mentions: 4     Fields:    Translation:HumansAnimals
    13. COVID-19 during Pregnancy and Postpartum. J Diet Suppl. 2022; 19(1):78-114. Naidu SAG, Clemens RA, Pressman P, Zaigham M, Davies KJA, Naidu AS. PMID: 33164606.
      View in: PubMed   Mentions: 9     Fields:    Translation:HumansCellsPHPublic Health
    14. COVID-19 during Pregnancy and Postpartum. J Diet Suppl. 2022; 19(1):115-142. Naidu SAG, Clemens RA, Pressman P, Zaigham M, Kadkhoda K, Davies KJA, Naidu AS. PMID: 33164601.
      View in: PubMed   Mentions: 11     Fields:    Translation:HumansCellsPHPublic Health
    15. Do Refined Grains Have a Place in a Healthy Dietary Pattern: Perspectives from an Expert Panel Consensus Meeting. Curr Dev Nutr. 2020 Oct; 4(10):nzaa125. Papanikolaou Y, Slavin JL, Clemens R, Brenna JT, Hayes D, Gaesser GA, Fulgoni VL. PMID: 33062912; PMCID: PMC7538308.
      View in: PubMed   Mentions: 2  
    16. A review of nutrition and dietary interventions in oncology. SAGE Open Med. 2020; 8:2050312120926877. Gray A, Dang BN, Moore TB, Clemens R, Pressman P. PMID: 32537159; PMCID: PMC7268120.
      View in: PubMed   Mentions: 17  
    17. A review of methanol poisoning: a crisis beyond ocular toxicology. Cutan Ocul Toxicol. 2020 Sep; 39(3):173-179. Pressman P, Clemens R, Sahu S, Hayes AW. PMID: 32396759.
      View in: PubMed   Mentions: 10     Fields:    Translation:HumansCellsPHPublic Health
    18. A Cross-Sectional Study on the Dietary Pattern Impact on Cardiovascular Disease Biomarkers in Malaysia. Sci Rep. 2019 09 20; 9(1):13666. Karupaiah T, Chuah KA, Chinna K, Pressman P, Clemens RA, Hayes AW, Sundram K. PMID: 31541144; PMCID: PMC6754378.
      View in: PubMed   Mentions: 6     Fields:    Translation:Humans
    19. Aloe vera at the frontier of glycobiology and integrative medicine: Health implications of an ancient plant. SAGE Open Med. 2019; 7:2050312119875921. Pressman P, Clemens R, Hayes AW. PMID: 35154752; PMCID: PMC8826108.
      View in: PubMed   Mentions: 4  
    20. What is the appropriate upper limit for added sugars consumption? Nutr Rev. 2017 01; 75(1):18-36. Rippe JM, Sievenpiper JL, Lê KA, White JS, Clemens R, Angelopoulos TJ. PMID: 27974597; PMCID: PMC5916235.
      View in: PubMed   Mentions: 18     Fields:    Translation:Humans
    21. Functionality of Sugars in Foods and Health. Compr Rev Food Sci Food Saf. 2016 May; 15(3):433-470. Clemens RA, Jones JM, Kern M, Lee SY, Mayhew EJ, Slavin JL, Zivanovic S. PMID: 33401825.
      View in: PubMed   Mentions: 41     Fields:    
    22. Food Addiction: Clinical Reality or Mythology. Am J Med. 2015 Nov; 128(11):1165-6. Pressman P, Clemens RA, Rodriguez HA. PMID: 26149675.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    23. Squeezing fact from fiction about 100% fruit juice. Adv Nutr. 2015 Mar; 6(2):236S-243S. Clemens R, Drewnowski A, Ferruzzi MG, Toner CD, Welland D. PMID: 25770266; PMCID: PMC4352186.
      View in: PubMed   Mentions: 31     Fields:    Translation:HumansPHPublic Health
    24. The future of oats in the food and health continuum. Br J Nutr. 2014 Oct; 112 Suppl 2:S75-9. Clemens R, van Klinken BJ. PMID: 25267248.
      View in: PubMed   Mentions: 11     Fields:    Translation:HumansAnimals
    25. Oats, more than just a whole grain: an introduction. Br J Nutr. 2014 Oct; 112 Suppl 2:S1-3. Clemens R, van Klinken BJ. PMID: 25405254.
      View in: PubMed   Mentions: 10     Fields:    Translation:HumansAnimals
    26. Mushrooms and Health Summit proceedings. J Nutr. 2014 Jul; 144(7):1128S-36S. Feeney MJ, Dwyer J, Hasler-Lewis CM, Milner JA, Noakes M, Rowe S, Wach M, Beelman RB, Caldwell J, Cantorna MT, Castlebury LA, Chang ST, Cheskin LJ, Clemens R, Drescher G, Fulgoni VL, Haytowitz DB, Hubbard VS, Law D, Myrdal Miller A, Minor B, Percival SS, Riscuta G, Schneeman B, Thornsbury S, Toner CD, Woteki CE, Wu D. PMID: 24812070; PMCID: PMC4056650.
      View in: PubMed   Mentions: 43     Fields:    Translation:HumansAnimals
    27. Conflicts of interest in approvals of food additives. JAMA Intern Med. 2014 Feb 01; 174(2):299-300. Clemens R, Schmidt D. PMID: 24493603.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    28. Whole grains and health: from theory to practice--highlights of The Grains for Health Foundation's Whole Grains Summit 2012. J Nutr. 2013 May; 143(5):744S-758S. McKeown NM, Jacques PF, Seal CJ, de Vries J, Jonnalagadda SS, Clemens R, Webb D, Murphy LA, van Klinken JW, Topping D, Murray R, Degeneffe D, Marquart LF. PMID: 23514771.
      View in: PubMed   Mentions: 8     Fields:    Translation:HumansAnimalsPHPublic Health
    29. Is "processed" a four-letter word? The role of processed foods in achieving dietary guidelines and nutrient recommendations. Adv Nutr. 2012 Jul 01; 3(4):536-48. Dwyer JT, Fulgoni VL, Clemens RA, Schmidt DB, Freedman MR. PMID: 22797990; PMCID: PMC3649724.
      View in: PubMed   Mentions: 30     Fields:    Translation:HumansPHPublic Health
    30. Filling America's fiber intake gap: summary of a roundtable to probe realistic solutions with a focus on grain-based foods. J Nutr. 2012 Jul; 142(7):1390S-401S. Clemens R, Kranz S, Mobley AR, Nicklas TA, Raimondi MP, Rodriguez JC, Slavin JL, Warshaw H. PMID: 22649260.
      View in: PubMed   Mentions: 46     Fields:    Translation:HumansAnimalsPHPublic Health
    31. Milk A1 and A2 peptides and diabetes. Nestle Nutr Workshop Ser Pediatr Program. 2011; 67:187-95. Clemens RA. PMID: 21335999.
      View in: PubMed   Mentions: 4     Fields:    Translation:HumansAnimals
    32. Are food cravings the body's way of telling us that we are lacking nutrients? Sci Am. 2005 Sep; 293(3):124. Pressman P, Clemens R. PMID: 16121863.
      View in: PubMed   Mentions:    Fields:    
    33. Development of immunoassay for detection of meat and bone meal in animal feed. J Food Prot. 2005 Sep; 68(9):1860-5. Kim SH, Huang TS, Seymour TA, Wei CI, Kempf SC, Bridgman CR, Momcilovic D, Clemens RA, An H. PMID: 16161685.
      View in: PubMed   Mentions: 1     Fields:    Translation:AnimalsCellsPHPublic Health
    34. Questioning the clinical significance of Salacia oblonga. J Am Diet Assoc. 2005 Aug; 105(8):1201; author reply 1201-2. Clemens RA, Pressman P. PMID: 16182633.
      View in: PubMed   Mentions:    Fields:    Translation:HumansAnimals
    35. Production of monoclonal antibody for the detection of meat and bone meal in animal feed. J Agric Food Chem. 2004 Dec 15; 52(25):7580-5. Kim SH, Huang TS, Seymour TA, Wei CI, Kempf SC, Bridgman CR, Clemens RA, An H. PMID: 15675807.
      View in: PubMed   Mentions:    Fields:    Translation:AnimalsCellsPHPublic Health
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