Gut Health & Low-FODMAP Nutrition Experts
Do you enjoy your food but still struggle with gut symptoms, weight, or low energy?
Are you eating a wide variety, yet something still doesn’t feel right?
Ongoing digestive, hormonal, or metabolic symptoms are your body’s way of asking for support.
A registered dietitian can help you understand what’s happening and how to fix it.
Metabolism & Energy Support
A comprehensive nutrition programme designed to address fatigue, feeling cold, poor sleep, low mood, low energy, and stubborn metabolic symptoms. We focus on identifying the root causes of metabolic dysfunction while supporting sustainable weight regulation and long-term health.
Gut Health & Digestive Nutrition
Our specialist gut health programmes are designed to relieve ongoing digestive symptoms and restore balance. We support conditions such as reflux, IBS, IBD, SIBO, and diverticular disease, with personalised nutrition plans and our dedicated Gut Health Course to optimise long-term wellbeing.
Gut Health–Led Weight Management
We help you resolve underlying gut issues so you can achieve sustainable weight loss, or healthy weight gain, while improving overall health and wellbeing. By addressing digestion first, we support long-term results without restrictive dieting.
Personalised Dietetic Assessment
A focused package offering five hours of dedicated dietetic support. We work closely with you to assess your health, identify risks, and create a personalised nutrition plan for prevention, optimisation, or performance, tailored entirely to your goals.
Sustainable Weight Loss Programme
Our expert dietitians use the latest evidence-based nutrition research to help you achieve safe, effective, and sustainable weight loss. This programme focuses on long-term behaviour change, metabolic health, and tailored dietary advice, not quick fixes.
Diabetes & Blood Sugar Nutrition
Personalised nutrition support for people with pre-diabetes or type 2 diabetes, extending far beyond basic management. This programme includes dietary assessment, blood marker review, and ongoing dietetic support to optimise blood sugar control and long-term health outcomes.
Sports Nutrition & Performance
Receive five hours of one-to-one dietetic support with a specialist in sports nutrition. We provide tailored nutritional guidance to improve performance, recovery, energy levels, and overall athletic wellbeing, suitable for all levels of sport.
Specialist Cancer Nutrition Support
Our specialist dietitian provides personalised nutritional support for people living with or recovering from cancer. We carefully assess your dietary needs, address treatment-related concerns, and develop a tailored nutrition plan to support strength, recovery, and quality of life.
30+
years of experience
About 121 Dietitian -
Gillian Killiner - Registered Dietitian
Gillian Killiner is a registered dietitian based in Belfast with over 30 years of experience providing personalised, evidence-based nutrition support for individuals and organisations across the UK. After 12 years working as a specialist dietitian within the NHS, Gillian identified a clear gap in care, the need for detailed, bespoke dietary advice tailored to real-life health challenges, alongside structured nutrition services to improve staff health and wellbeing in the corporate sector. In 2008, 121 Dietitian was established to deliver expert dietetic care beyond the traditional clinical setting.
Hormonal imbalances
GUT health
Preparation and surgical recovery
Disordered eating
Resistant weight loss
Weight gain
Sports nutrition
If you’ve been struggling with ongoing gut symptoms such as bloating, wind, constipation, diarrhoea, abdominal pain, or fatigue, even after medical tests or GP appointments, our 121 Dietitian Gut Health Programme is designed to help.
This is not a quick fix or generic gut cleanse. It’s an evidence-based, dietitian-led gut health course focused on identifying root causes and supporting long-term digestive health. Through self-paced learning modules, expert video guidance, and practical nutrition strategies, you’ll gain the tools to improve symptoms and take control of your gut health in as little as 10 days.
For full programme details, visit our Gut Health Course page and scroll down to subscribe for our free Goal-Setting Gut Health Guide.
See Reviews From Our Clients
Dorothy Haveron
Veisha Evans
Jay Rafferty
121 Dietitian is proud to have been published in
We offer a range of dietitian-led gut health programmes designed to support the management of digestive symptoms while improving overall health and wellbeing. Each programme is tailored to specific gastrointestinal conditions and provides personalised nutrition guidance and practical lifestyle strategies to support better digestion and long-term gut health.
This program is for those who wish for prevention or optimization of their unique dietary needs. The journey begins with an initial 1-hour appointment, led by the brilliant Gillian Killiner RD, a highly skilled dietitian. This initial consultation sets the stage for a personalised plan to enhance your health.
This program is designed to provide four months of personalized support and guidance from our expert dietitians using the latest research. Our aim is to help you achieve your weight loss goals safely and effectively, while also improving your overall health and well-being through tailored dietary advice.
By enrolling in this program, you will receive 8 hours of personal dietetic consultation over 4 months. The initial two consultations will focus on addressing your gastrointestinal symptoms. The remaining consultations will provide tailored advice to support your weight loss journey, ensuring sustained health improvements.
This program offers a comprehensive approach to improving sports performance, diet, and overall health. By booking, you will receive five hours of personalised dietetic time with our team of experts. Our specialists will provide tailored nutritional guidance to enhance your athletic performance and overall well-being.
Immerse yourself in a transformative 4-hour program designed to cater to your unique needs. This comprehensive experience begins with an initial 1-hour appointment. Our highly skilled Specialist Dietitian will carefully assess your dietary requirements, address any concerns, and develop a tailored plan to support your health.
Consultations tailored to meet your individual needs, extending beyond the management of pre or type 2 diabetes. It encompasses diet and overall health, including personalised advice, plans, shopping lists, and recipes. The program also involves checking bloods, a further review, and continuous support to optimise your health outcomes.
A deep dive program designed to address fatigue, feeling cold, poor sleep, low mood, low energy, and low metabolic symptoms. It tackles autoimmunity and ongoing weight concerns with unparalleled success. The program integrates personalised dietary and lifestyle interventions, ensuring sustainable improvements in your overall metabolic health.
Invest in Your Health Series
We’re pleased to introduce our Invest in Your Health Series! A collection of expert-led online nutrition programmes designed to help you take control of your health with confidence.
Each programme focuses on key areas such as gut health, blood sugar regulation, and overall wellbeing, using evidence-based nutrition guidance to support sustainable, long-term results. These online courses are led by experienced dietitians and are suitable for anyone looking to improve their health through practical, personalised nutrition strategies.
Watch the video below where registered dietitian Gillian Killiner explains the Invest in Your Health Series and how these online programmes can support your individual health journey.
Suffer from IBS?
We Can Change Your Life!
Up to 95% success rate
Get in touch to learn how we can support you with the new low FODMAPs diet
30+ Years Experience
Helped 1000’s of clients
One to one or online
