Gillian Killiner - About 121 Dietitian
Founder, 121 Dietitian (2008)
UK-leading Dietitian Gillian Killiner provides tailored nutritional advice to individuals and the corporate sector. After 12 years as an NHS specialist Dietitian, she recognised a clear need for more detailed, personalised dietary support. As a result, she now delivers bespoke nutrition guidance to clients while also helping businesses improve staff health and wellbeing through targeted, practical strategies.
"The bespoke, tailored advice I provide is reassuring in a world that revolves around fad diets and conflicting inaccurate information. The 121 Dietitian team are acutely aware of how multiple factors impact on health, and thus always have their clients; dietary, health, economic, and well-being interests at heart. They not only provide this unique nutrition service in Belfast but also worldwide and they won an award back in 2010 for being so innovative!"
~Gillian Killiner~
How 121 Dietitian Helps
121 Dietitian’s award-winning nutritional consultants provide personalised, specialist advice on diet and health. In addition, they analyse blood test results to assess nutrient levels, ensuring each programme is tailored accurately and appropriately to the individual.
Key Specialties:
- Hormonal imbalances
- Female Health
- Preparation and surgical recovery
- Disordered eating
- Resistant weight loss
- Weight gain
- Sports nutrition
- Gut health
- Chronic ill-health/inflammation
- Poor sleep
- Stress/Fatigue
- Mental health
- Performance at work
- Nutrigenomics - Nutrition and genetics
Why Choose 121 Dietitian?
- Firstly, we know how frustrating it is trying to separate credible nutrition advice from misinformation. The confusion is overwhelming and it’s holding people back.
- Secondly, while conventional medicine is vital, it doesn’t always provide complete answers. Many people struggle with their health day to day with no answers.
- Importantly, Gillian herself has overcome chronic illness by combining medical treatment with evidence-based nutrition, giving her both professional and personal insight.
- Therefore, our integrated nutritional and medical approach delivers structured, measurable results.
- Ultimately, we do the science -so you can EAT the REWARDS!
121 Dietitian Saves You Money
We show you how to shop healthily while keeping food bills under control. In addition, you’ll discover tasty, cost-cutting lunch ideas and convenient recipes that fit real life. Most importantly, we treat the whole person - supporting your health while helping you save money. What’s not to like?
Gillian's Professional Background
Research
Gillian grew up and studied in London, where she secured a prestigious research post in Nutrition and Heart Disease with the World Health Organisation (WHO). Later, during the Covid pandemic, she undertook a further one-year research position at Ulster University, specialising in one-carbon metabolism.
Training
Her specialist training took place within the Charter Mark award-winning Dietetic Department at Guy’s and St Thomas’ Hospital, London. Subsequently, her career progressed across hospitals in Northern Ireland, where she specialised in respiratory medicine, cancer, and haematology.
Education
Gillian qualified with a Master’s Degree (MSc) in Human Nutrition and Dietetics from the University of Ulster, Northern Ireland, in 1997.
Additional certifications:
- Essential Obesity: Psychological Approaches (NCFED)
- Low FODMAP Practitioner (King's College London)
- Nutrigenomics Practitioner Programme (Lifecode Gx)
Consultancy
After starting a family in Northern Ireland, Gillian established her Dietetic Consultancy Service in Belfast, enabling her to combine extensive clinical expertise with family life.
Since then, 121 Dietitian has grown steadily, offering consultations worldwide while still providing face-to-face appointments across Northern Ireland.
Your Health Concerns Understood
Gillian understands the real-life restrictions many people face, having seen the impact of chronic illness from an early age when her mother was diagnosed with multiple sclerosis. She later faced her own diagnosis of Hashimoto’s, an autoimmune thyroid condition. However, by combining medical treatment with targeted nutritional strategies, she successfully achieved remission and now uses both her professional expertise and personal experience to guide others.
121 Dietitian Helps the Environment
As well as benefiting from personalised nutrition advice, you’ll also be supporting a more sustainable service. By becoming a 121 Dietitian client and using this service, you may potentially reduce your carbon footprint.
In addition, our Practice Better paperless system and online consultations minimise printing and travel. As a result, our approach supports both your health and the environment.