Ms Yvonne McKenzie

About

Special interests

Yvonne provides personalised, evidence-based dietary treatment and management of gastrointestinal disorders or diseases in adults, optimising bowel health including stoma care, and nutritional adequacy:

Yvonne McKenzie specialises in:

• Coeliac disease
• Constipation
• Diarrhoea
• Diverticulosis
• Excessive wind (flatulence) and bloating
• Fatty liver disease
• Food intolerances associated with gut symptoms or gut symptoms that have not yet been medically explained
• Gallbladder: dietary considerations before or after its removal
• Gastroparesi
• Irritable Bowel Syndrome (IBS)/disorder of gut-brain interaction
• Pancreatic exocrine insufficiency
• Reflux.

Other medical issues Yvonne often advises on:

• Assessment of unintentional body weight change
• Bile acid diarrhoea
• Correcting and preventing nutritional deficiencies such as vitamin D and iron 
• Health eating and lifestyle 
• Osteopenia/osteoporosis 
• Preservation of skeletal muscle mass through diet and lifestyle.

Other interests

• Diet therapy for managing bile acid diarrhoea
• Dietary fibres
• FODMAP diet
• IBS Probiotics.

Languages spoken

English

Treatments and tests offered by Ms Yvonne McKenzie at Nuffield Health

• Dietician

Locations Ms Yvonne McKenzie works with

Related experience

Research

Yvonne’s PhD research explored diet therapy for managing bile acid diarrhoea, Sept 2019 to 2025, supervisors: Dr Sorrel Burden and Prof Chris Todd. One-third of people treated for diarrhoea-predominant irritable bowel syndrome actually have bile acid diarrhoea (BAD). BAD is an under-recognised, under-appreciated, and under-researched medical condition estimated to affect about 1% of the UK’s general adult population.

Yvonne McKenzie was a co-investigator for an NIHR funded research study: Management of diarrhoea in patients with stable ulcerative colitis with low FODMAP diet, amitriptyline, ondansetron or loperamide: the MODULATE RCT, led by Professor Alex Ford. Published March 2025: https://doi.org/10.3310/GHFE4871

As a diet expert, Yvonne McKenzie has made many national contributions to improve healthcare in IBS and BAD over the last 10+ years:

James Lind Alliance priority setting partnership, funded by the British Society of Gastroenterology and Guts UK: Top 10 research priorities for IBS. Published June 2023: https://gutscharity.org.uk/wp-content/uploads/2023/06/IBS-The-UKs-Top-10-Research-Priorities-FINAL.p...

With the National Institute for Health and Care Excellence: -SeHCAT (taurocholic [75 selenium] acid) for diagnosing bile acid diarrhoea. Diagnostics guidance DG44. Published Nov 2021. https://www.nice.org.uk/guidance/dg44 -Irritable bowel syndrome in adults: diagnosis and management. Clinical guideline CG61 Update 2016. http://www.nice.org.uk/Guidance/CG61 -Irritable bowel syndrome in adults. Quality Standard QS114. Published Feb 2016. https://www.nice.org.uk/guidance/qs114

With the BDA:

First author of the British Dietetic Association's evidence‐based practice guidelines for the dietary management of IBS in adults (2016 update, 2012).

Publications in peer-reviewed scientific journals:

Staudacher HM, Costas-Batlle C, Phillips M, Anderson S, McKenzie, YA, Lomer MCE. Dietary modifications in patients with non-inflammatory bowel disease diarrhoea: a summary of the evidence and practical considerations. Frontline Gastroenterology. 2025 June.

McKenzie YA, Kelman L, O’Connor M, Todd C, Walters JRF, Burden S. Diet therapy (The 8x5 Diet) for adults living with bile acid diarrhoea: protocol for a feasibility randomised controlled trial. BMJ Open. 2025; 0:e097973. 2025 March. doi: 10.1136/bmjopen-2024-097973.

French C, McKenzie Y, Stanmore E, Burden S. Are Mobile Apps Effective at Targeting Physical Activity or Malnutrition in Community-Dwelling Older Adults? A Systematic Review and Meta-Analysis. Journal of Aging and Physical Activity. 2024 Dec;1(aop):1-3. doi: 10.1123/japa.2023-0449.

McKenzie YA, French C, Todd C, Burden S. Food intolerance related to gastrointestinal symptoms amongst adults living with bile acid diarrhoea: A cross‐sectional study. Journal of Human Nutrition and Dietetics. 2024 Feb;37(1):79-93. doi: 10.1111/jhn.13232.

Black CJ, McKenzie YA, Scofield-Marlowe M, Setter P, Tarpey M, Ford AC, West H, Southey E, Thompson J, Corsetti M, Everitt HA. Top 10 research priorities for irritable bowel syndrome: results of a James Lind Alliance priority setting partnership. The Lancet Gastroenterology & Hepatology. 2023 June;8(6):499-501. doi: 10.1016/S2468-1253(23)00072-9.

McKenzie YA, Sremanakova J, Todd C and Burden S. Effectiveness of diet, psychological, and exercise therapies for the management of bile acid diarrhoea in adults: A systematic review. Journal of Human Nutrition and Dietetics. 2022 March;35:1087–1104. doi: 10.1111/jhn.13005.

Rej A, Avery A, Ford AC, Holdoway A, Kurien M, McKenzie Y, Thompson J, Trott N, Whelan K, Williams M, Sanders DS. Clinical application of dietary therapies in irritable bowel syndrome. Journal of Gastrointestinal & Liver Diseases. 2018 Sep 1;27(3). doi: 10.15403/jgld.2014.1121.273.avy.

McKenzie YA, Bowyer RK, Leach H, Gulia P, Horobin J, O'Sullivan NA, Pettitt C, Reeves LB, Seamark L, Williams M, Thompson J. British Dietetic Association systematic review and evidence‐based practice guidelines for the dietary management of irritable bowel syndrome in adults (2016 update). Journal of Human Nutrition and Dietetics. 2016 Oct;29(5):549-75. doi: 10.1111/jhn.12385.

McKenzie YA, Thompson J, Gulia P, Lomer MC, (IBS Dietetic Guideline Review Group on behalf of Gastroenterology Specialist Group of the British Dietetic Association). British Dietetic Association systematic review of systematic reviews and evidence‐based practice guidelines for the use of probiotics in the management of irritable bowel syndrome in adults (2016 update). Journal of Human Nutrition and Dietetics. 2016 Oct;29(5):576-92. doi: 10.1111/jhn.12386.

McKenzie YA, Alder A, Anderson W, Wills A, Goddard L, Gulia P, Jankovich E, Mutch P, Reeves LB, Singer A, Lomer MC. British Dietetic Association evidence‐based guidelines for the dietary management of irritable bowel syndrome in adults. Journal of Human Nutrition and Dietetics. 2012 Jun;25(3):260-74. doi: 10.1111/j.1365-277X.2012.01242.x.

Books

Yvonne has written many chapters on IBS:

• BDA Manual of Dietetic Practice: 5th (2014), 6th (2019) and 7th (due May 2026) editions
• BDA Dietetic and Nutrition Case Studies (2016)
• Oxford Handbook of Nutrition & Dietetics, 3rd edition (2021).

Memberships

• British Dietetic Association (BDA)
• British Society of Gastroenterology
• Primary Care Society for Gastroenterology
• Health and Care Professions Council

Insurers Ms Yvonne McKenzie works with

Ms Yvonne McKenzie works with the following private medical insurance providers:

• Aetna
• Aviva Health
• AXA Health
• AXA - Global Healthcare
• Benenden Health
• Bupa
• Bupa Global
• Cigna
• Cigna International
• CS Healthcare
• Healix
• Health-on-Line
• PHC
• Simplyhealth
• Standard Life
• Vitality Health (Pru Health)
• WPA
• The Exeter

Declaration

Ms Yvonne McKenzie does not hold a share or financial interest in this hospital, another Nuffield Health hospital or the company.

Ms Yvonne McKenzie does not have a share or financial interest in equipment used at this hospital or another Nuffield Health hospital.

Ms Yvonne McKenzie does not hold any paid advisory role(s) at this hospital or on behalf of Nuffield Health.