Third Sister – Registered Dietitian

Helping women feel great in their own skin

through personalised, science-led dietetics

Welcome to Third Sister

A space for real women, real talk, real solutions

Third Sister was created with the sole focus of helping real women with real lives and unique challenges find real solutions. Our approach to dietetics is grounded in science and delivered with genuine care, helping you navigate your personal health journey with confidence and clarity.

We help real women navigate their individual struggles, and sometimes that means facing some hard truths—but not without solutions and support. The Third Sister practice is a safe space where you can openly discuss your symptoms and health goals. Whether you’re managing a specific condition like PCOS, looking for a personalised diet plan for weight loss, seeking dietary advice whilst going through menopause, or just looking to integrate healthier eating habits, we are here to provide judgement-free guidance that’s not just prescriptive but also assistive.

Diet is not a one-size-fits-all

We would never advise our patients to follow a one-size-fits-all diet plan or a specific diet lifestyle.Instead, we tailor each of our dietary strategies around your unique challenges, requirements, and even dependencies. You will feel seen, supported, and celebrated through our work together. Women’s lives are multifaceted and dynamic, so why shouldn’t our diets be? Our holistic assessments take into account every aspect of your life—from environment and experiences to symptoms and struggles—to craft a personalised plan that resonates with your goals and lifestyle.

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Meet your dietitian

Clementine Vaughan, Msc Nutr, PG Dip RD

Hi, I’m Clem, a registered dietitian based in London. Growing up in a British-French household where meals were an important meeting point for our family, I learnt early on that food has the power to connect and heal. Being the third of three sisters, I understand the great value of shared wisdom and support. After facing my own health challenges and finding the support I needed from family, friends, and professionals, I turned my deep love for food and background in dietetics into a career dedicated to helping women heal. You can see me as a partner, confidante, and sister in your health journey.

Your personalised diet plan

If you’re tired of cookie-cutter diet plans found on Google/social media that don’t work for your body, a personalised diet approach might be a better option for you. I offer 3-12 month bespoke diet programs that are informed by—and tailored to—your unique blueprint, so that you can actually start to feel a difference.

I specialise in providing personalised diet plans for women who need help with the following:

Start with a free, 60-90 minute detailed assessment, and we can discuss a roadmap that works best for you.

Honest, holistic approach

Despite extensive studies of the human body, there's still frustratingly little research specifically focused on women in the medical world. This might be why you’re here—traditional medicine has viewed your issues through a narrow lens, and you have seen no real results. This is why I follow a holistic approach, valuing modern medicine alongside other methods.

Although I may not have all the answers all the time, my approach draws from a diverse range of practices to meet your goals while adapting to your needs. Clinical dietetics forms the foundation of my work, but I also incorporate elements of nutrition, functional medicine, behavioural therapy, naturopathy, and modern medicine to empower you with a personalised, multidisciplinary plan that is responsive to your preferences and lifestyle. I will tailor my advice to fit into your world, not the other way around.

I will tailor my advice to fit into your world, not the other way around.