tel: 0207 132 1440  email:

Dr Gareth Parkes  BA MA PhD MRCP


Queens’ College Cambridge BA, MA

Bart’s and the London Medical School - MBBS with distinction

King’s College London - PhD - The role of the gastrointestinal bacteria in the development of irritable bowel syndrome


Current Roles

Consultant Gastroenterologist - Royal London Hospital, Bart’s Health NHS Trust

Consultant Endoscopist and Gastroenterologist - London Independent Hospital

Consultant Gastroenterologist - LycaHealth - No 1 Westferry Circus



I have a specialist interest in luminal gastroenterology, in particular inflammatory bowel disease and irritable bowel syndrome. Within my NHS role I work in a team treating complex Crohn’s and Ulcerative colitis that I am an experienced endoscopist competent in gastroscopy, flexible sigmoidoscopy, colonoscopy and polyp removal.


Inflammatory Bowel Disease

I have had experience in three major centres in inflammatory bowel disease and now am part of a team of IBD specialists at the Royal London. I have published in this area and I am actively involved with clinical trials of novel biological therapies. I have experience in specialist IBD endoscopy, novel biologic agents and complex IBD patients.


Irritable Bowel Syndrome

I have an active interest in irritable bowel syndrome or IBS, in particular in the role that diet and the gut microbiota play in the causes and treatment for this condition. I have published widely in this field in particular in the role that probiotic preparations can have in the treatment of IBS.



I have broad range of endoscopic experience and I am competent in a wide range of diagnostic and therapeutic procedures including in the diagnosis of cancer, ulcers, Barrett’s oesophagus, colitis, Crohn’s disease, diverticular disease and polyps. In particular I specialise in difficult colonoscopy and polypectomy as well as working as a trainer within the NHS .



General Medical Council

British Society of Gastroenterology

European Crohn’s and Colitis Organisation



Parkes GC, Whelan K, Lindsay JO.Smoking in inflammatory bowel disease: impact on disease course and insights into the aetiology of its effect. J Crohns and Colitis 2014 Aug 1;8(8):717-25


Elliott TR, Hudspith BN, Wu G, Cooley M, Parkes G, Quiñones B, Randall L, Mandrell RE, Fagerquist CK, Brostoff J, Rayment NB, Boussioutas A, Petrovska L, Sanderson JD. Quantification and characterization of mucosa-associated and intracellular Escherichia coli in inflammatory bowel disease. Inflamm Bowel Dis. 2013 Oct;19(11):2326-38.


Parkes GC, Rayment NB, Hudspith BN, Petrovska L, Lomer M, Brostoff J, Whelan K, Sanderson JD. Distinct microbial populations exist in the mucosa-associated microbiota of sub-groups of irritable bowel syndrome. Neurogastroenterol Motil. 2012 Jan;24(1):31-9


Walker AW, Sanderson JD, Parkes GC, Churcher C, Hudspith BN, Rayment NB, Brostoff J, Parkhill J, Dougan G, Petrovska L. BMC Microbiol. Jan 2011;11 (7) High-throughput clone library analysis of the mucosa-associated microbiota reveals dysbiosis and differences between inflamed and non-inflamed regions of the intestine in inflammatory bowel disease.


Prescott NJ, Dominy KM, Kubo M, Lewis CM, Fisher SA, Redon R, Huang N, Stranger BE, Blaszczyk K, Hudspith B, Parkes G, Hosono N, Yamazaki K, Onnie CM, Forbes A, Dermitzakis ET, Nakamura Y, Mansfield JC, Sanderson J, Hurles ME, Roberts RG, Mathew CG.Independent and population-specific association of risk variants at the IRGM locus with Crohn's disease. Hum Mol Genet. 2010 May 1;19(9):1828-39.


Parkes GC, Sanderson JD, Whelan K. Treating irritable bowel syndrome with probiotics: the evidence. Proc Nutr Soc. 2010 May;69(2):187-94. 2010 Mar 18.


Parkes GC, Sanderson JD, & Whelan, K. The mechanisms and efficacy of probiotics in the prevention of Clostridium difficile-associated diarrhoea. Lancet Infect Dis 2009;9:237-244


Parkes GC, Brostoff, J., Whelan, K. & Sanderson, JD. Gastrointestinal microbiota in irritable bowel syndrome: their role in its pathogenesis and treatment Am J Gastroenterol.2008; 103:1557-1567


Lomer MC, Parkes GC, Sanderson JD. Review article: lactose intolerance in clinical practice--myths and realities. Aliment Pharmacol Ther 2008;27(2):93-103.


Sanderson JD, Parkes GC. Timing of surgery for inflammatory bowel disease. BMJ 2007;335(7628):1006.

 Parkes GC, Sanderson JD. One man and his scope. Int J Clin Pract 2006;60(6):633-4.


Parkes GC, The role of probiotics in the treatment of irritable bowel syndrome, in Bioactive Foods in Promoting Health: Probiotics and Prebiotics. Editors: Watson RR, Preddy VR. Pub Elsevier


Parkes GC The use of probiotics and prebiotics in the treatment of IBS. in Nutrition and GI disease. Editor Lomer MC. Published by Wiley




Tel: 020 7132 1440    email:

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