This isn’t generic nutrition advice. Discover the full-body assessment and answers you’re seeking with personalised nutrition and functional testing, designed to uncover the root causes and increase your quality of life.

Feeling unwell despite normal blood tests?

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At the heart of our practice lies a simple truth: health is deeply personal.

At the heart of our practice lies a simple truth: health is deeply personal.

We understand that no two individuals are the same, and neither are their health journeys. In a world overflowing with generic advice and one-size-fits-all solutions, we stand apart with a commitment to truly personalised care.

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Meet Jessica, Registered Nutritional Therapist

✧ Postgraduate 3-year Diploma in Nutritional Therapy

✧ Masters Degree in Personalised Nutrition

✧ Previous Medical Education Specialist and Specialised Training at a Functional Medicine Laboratory

✧ BANT and CNHC Registered

✧ Certified Member of the Institute of Functional Medicine

✧ Specialised Training in Epigeneics/DNA

As seen in

Areas of Speciality

  • These conditions can range from Irritable bowel Syndrome (IBS), Inflammatory Bowel Disease (IBD), Celiac Disease, Small Intestinal Bacterial Overgrowth (SIBO), Gastritis, H-Pylori Infections, Gastroesophageal Reflux Disease (GERD), Diverticulitis, Gastroparesis and more.

  • Menstrual Disorders such as Dysmenorrhea (painful periods), menorrhagia (heavy periods), amenorrhea (absence of periods), premenstrual syndrome (PMS), PCOS, Endometriosis, Fibroids, Vaginal Infections, Infertility, Depression and Anxiety, Premenstrual Dysphoric Disorder (PMDD), Thyroid Disorders, Urinary Tract Infections (UTIs) and more.

  • Athletic Performance, Reproductive Health, Musculoskeletal Health, Cardiovascular Health, Sexual Health, Prostate Health, Depression and Anxiety and more.

  • Stress is the body's reaction to feeling overwhelmed or threatened, often causing anxiety, tension, and fatigue, and it can have a significant physiological effect on your body. Burnout is a state of emotional, physical, and mental exhaustion caused by excessive and prolonged stress, leaving one feeling drained and unable to cope with daily demands.

  • High performance in the workplace demands sustained effort and productivity, which can lead to stress and burnout, significantly impacting employees' overall well-being. This constant pressure to perform at peak levels can result in anxiety, fatigue, and decreased job satisfaction, ultimately affecting both mental and physical health.

  • Histamine is a chemical involved in the body's immune response, which can cause allergy-like symptoms such as itching, swelling, and hives, and it can have a significant physiological effect on your body. Mast Cell Activation Syndrome (MCAS) is a condition where mast cells inappropriately release excessive amounts of histamine and other chemicals, leading to chronic, multisystem symptoms that can be challenging to manage.

  • Autoimmune diseases occur when the immune system mistakenly attacks the body's own tissues, leading to chronic inflammation and damage, and this can have a significant physiological effect on your body. Conditions such as rheumatoid arthritis, lupus, multiple sclerosis, and Hashimoto's thyroiditis are examples of autoimmune diseases, each affecting different parts of the body and requiring specific management strategies.

  • Jessica’s research was in the field of ME/CFS. She works with fatigue related conditions such as ME/CFS, Fibromyalgia and Long-Covid. If you have been medically diagnosed with this condition please email me on jessica@theoptimumhealthclinic.com

We can support you by

  • Root Case

    A full-body assessment and answers you’re seeking with personalised nutrition and functional medicine, designed to uncover the root causes and increase your quality of life.

  • Personalised

    We understand that no two individuals are the same, and neither are their health journeys. In a world overflowing with generic advice and one-size-fits-all solutions, we stand apart with a commitment to truly personalised care.

  • Evidence informed

    Your programme will be informed by the latest scientific research and methodology.

Bespoke 1:1 Consultations

Experience personalised care through our one-on-one consultations, where we take the time to understand your unique health concerns and goals. We develop tailored nutrition and lifestyle plans that address your specific needs, ensuring you receive the most effective and sustainable solutions for optimal wellness.

Functional Testing

Our comprehensive functional testing dives deeper than standard medical tests, uncovering hidden imbalances and root causes of your health issues. We also meticulously review any previous medical tests to provide a complete understanding and create a more accurate and effective wellness plan.

Corporate Wellness Packages

Elevate your team's health and productivity with our corporate and executive wellness packages. Designed to meet the demanding needs of the modern workplace, these programs offer bespoke wellness strategies, stress management, and nutritional guidance to foster a healthier, more vibrant workforce.

Add your name to the waiting list and apply to work with Jessica

Client Reviews

  • I started seeing Jessica whilst I held an executive position in a fast growing AI company. She helped me get to the root cause of many health issues that left me chronically ill for 15 years, and within 1 month of working on our plan I felt the healthiest and least stressed and anxious I had ever felt. I felt I was able to take on 90% more stress, I become calmer, more resilient, and I was no longer on antibiotics monthly. It's now been 2 years and I haven't needed antibiotics, or caught the colds everyone else got around me. It helped me perform better at work, whilst also living a happier fuller life. I loved it so much we invited her to do talks at work which many people gained useful insights from and also decided to work with her following those. Those who worked with her from my office, also saw positive impacts on their performance at work. I could not recommend her more highly.

    By Carolin Fleissner

  • Having had a number of issues with food allergies, eating habits and my low moods, Jessica O’Dwyer helped identify where the problems lay and provided me with the support and practical advice I needed to overcome them. Jessica has great empathy and at times, when I felt discouraged, she was able to encourage me into positive action. Changing eating habits is hard but with Jess’s moral and clinical support I am in a much healthier place, both mentally and physically than when I started over 3 months ago. Jess will not overwhelm you with the detail, but explains things clearly and gives practical advice which even a simple man can follow. My experience of working with Jessica is of an extremely courteous, professional, knowledgeable and empathetic nutritionist who is passionate about her job and helping people. If you are unsure or wondering where to begin, I would not hesitate to contact Jessica O’Dwyer to discuss your needs.

    By James Kelly

  • I worked with Jess personally for over a year on a gut issue I was having. Her knowledge is brilliant, she is always up-to-date with the latest research and testing, and has a great understanding of personalised nutrition. Jess has also supported our food supplement company since we launched, helping formulate our products, advise on social content and facilitating online education workshop. Would highly recommend her for both personal and corporate work!

    By Fergus Kerrigan

  • I just want to thank Jess for helping me throughout the 2 years, she is the kindest person and super knowledgeable in her field. She is really thorough at assessing the root cause and really helped the issues I was facing. I am now in a happier and healthy state, mind and body and I couldn't have got there without Jess' support and guidance. I highly recommend her services, and will now be sad to not have any regular appointments (which I suppose is a testament to the progress). Thank you again!

    By Vinunti Trivedi

  • I just wanted to say a big thank you. Working with you over the last year and a half has felt like a huge support, you have a very warm way of feeling like a friend when necessary but also balancing it with making me pull my act together when I'm being a bit lax in certain areas. Your way of combining nutritional guidance with a holistic approach that acknowledges that lifestyle can get in the way sometimes, so trying to work with it rather than against, is what has kept me coming back. It's hard with our bodies when we don't see direct results to think that something isn't working, but working with you has enabled me to pay so much more attention to what does and doesn't work and I feel much more attune with my body.

    By Natasha Bell

Book a free introductory call to discuss your needs and explore your options. Let’s see if we’re the right fit to help you achieve your health and wellness goals.