About me
121 Dietitian is led by Northern Ireland’s award-winning and highly experienced Dietitian Gillian Killiner BSc (Hons), MSc, RD, mBDA, HCPC.
With 30 years of expertise in hospital, private, and freelance settings, I have had the privilege of helping thousands of people reclaim their health through personalised, evidence-based nutrition.
I was the first Dietitian trained to the Charter Mark Standard at Guy’s and St Thomas’ Hospital, London, and brought this excellence home to Northern Ireland where I specialised in Haematology at Belfast City Hospital, with further training in Paediatrics, Gastroenterology, Respiratory, and Oncology.
At 121 Dietitian, we understand that every client is unique. That’s why we take time to assess the whole person—not just isolated symptoms. Our tailored nutrition programmes are designed to support long-term health goals, whether you're managing a medical condition, optimising your wellbeing, or seeking support with lifestyle change.
We proudly offer flexible appointment options via our secure online portal or in-person clinics—available UK, Ireland, and globally—from 8am to 10pm.
What We Offer
Personalised nutrition programmes for:
- Gut health: IBS (Low FODMAP Qualified), IBD, Coeliac, Diverticular Disease, Reflux, Pancreatic exocrine insufficiency, Bile acid malabsorption, Eosinophilic oesophagitis
- Women’s health: PCOS, hormonal imbalances, menopause, healthy weight loss
- Chronic illness: Type II Diabetes, Anaemia, Inflammation
- Autoimmune conditions: Hashimoto's, MS...
- Weight management, Wegovy & GLP-1 support
- Cancer (Oncology/Haematology)
- Food intolerances,
- Nutrigenomics
- Maternal & child health
- Sports performance & recovery
- Corporate Services: We deliver engaging wellness workshops and seminars addressing staff health, absenteeism, productivity, and CSR. I am one of the few UK dietitians trained by the BDA to offer the accredited Work Ready Programme in Northern Ireland.
- Professional Services: Recipe analysis, food product development, media consultation, and expert commentary for TV, radio, and print.
Why Choose 121 Dietitian?
Fully qualified and HCPC-registered
Backed by decades of clinical experience
A holistic, compassionate approach with real results
Everyone's talking about longevity—but it’s nothing new to us. For over 28 years, we’ve built our care around exactly that: helping people live better, longer, healthier lives.
Testimonials available from real clients who’ve seen life-changing improvements on Google reviews and social media.
“We’re not here to restrict your life—we’re here to enhance it. Through delicious, nutrient-rich food and the knowledge to make confident choices, you can feel better for good.”
If you have any questions about our services, feel free to email or call—we’d love to help.
Environmentally friendly paperless service.
Please note: we are unable to accommodate work experience placements for school or non-dietetic students.
Training, qualifications & experience
BSc. (Hons) MSc. Human Nutrition and Dietetics - University of Ulster (q.1997)
Low FODMAP specialist qualification for IBS - King's College London 2010
Counterweight, Counterweight Plus and Counterweight families trained 2014 BDA.
Psychology of Obesity trained - National Centre for Eating Disorders - London 2016
Work Ready Programme trained for - Northern Ireland 2016. British Dietetic Association.
HCPC registered
British Dietetic Association Registered Member
Member organisations
school Registered / Accredited
Being registered/accredited with a professional body means an individual must have achieved a substantial level of training and experience approved by their member organisation.
The HCPC are an independent, UK-wide health regulator. They set standards of professional training, performance and conduct for 14 professions.
They keep a register of health professionals who meet their standards, and they take action if registered health professionals fall below those standards. They were created by a piece of legislation called the Health Professions Order 2001.
Registration means that a health professional meets national standards for their professional training, performance and conduct.
Nutrition topics
info Information about health conditions (*)
Nutritional therapy can help enhance the well-being of individuals diagnosed with serious medical conditions, but should not take the place of medical treatment and advice. If you have been diagnosed with - or suspect you may have - any of these conditions, please speak to your doctor before starting nutritional therapy or making any major changes to your diet or lifestyle.
Photos & videos
Fees
£50.00 - £700.00
Free initial telephone session
Health Insurance/EAP
Additional information
121 Dietitian is truly unique—our results speak for themselves, and our pricing is clear, fair, and excellent value for the level of expert care provided.
We offer a complete peace-of-mind range of programmes designed to deliver everything you need in one clear package—no hidden costs, no surprise add-ons. Our programmes start at just £120, making expert nutrition advice more affordable than repeated, piecemeal appointments that can quickly add up elsewhere.
From the moment you start, we guide you with proven, personalised advice—ensuring fewer sessions are needed and helping you reach your goals faster, saving both time and money.
If you’re unsure whether a package is right for you, simply book a free discovery call. We’ll help match you with the best option for your needs and budget.
Our mission: To help you achieve optimal health while still enjoying the foods you love—just made different.
When I work
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Monday to Thursday 9am-9pm
Further information
We’d love to support you on your health journey!
Booking your appointment couldn’t be easier—just visit our Book Now page and complete your booking through our secure Practice Better portal.
Whether you’re looking for help with a specific health concern or just want to feel your best, you can choose a time and date that suits you—either in person at our Holywood clinic or online from anywhere in the world.
Once you're registered, our secure Practice Better platform allows you to:
- Choose and book a package tailored to your needs
- Complete your pre-assessment food diary and health questionnaire
- Schedule and manage your appointments
- Access your personalised nutrition plan and follow-up advice
- Message your Dietitian directly for guidance and support
- You can also preview our Client Portal experience and view Gillian Killiner’s public profile on the website.
Not sure what service you need?
We recommend booking a mini consultation to chat through your goals and let us guide you to the best option.
Warm wishes,
Gillian
