Clementine Vaughan, nutritionist and dietitian in London specialising in PCOS and more.

The Ongoing Frustration of PCOS

Find relief with a personalised diet plan for PCOS

Registered dietitian Clementine Vaughan discussing a personalised diet plan with a client

The PCOS Struggle is Real

If you have PCOS, you’re likely tired of feeling frustrated—frustrated with your symptoms, frustrated with your body, and frustrated with the one-size-fits-all advice you’ve been given.

“I don’t know what I’m doing wrong…”
“Something I’ve been doing for years is now making me feel awful…”
I’m at my wit’s end…”

I hear this every single day from new clients struggling with unexplained weight changes, bloating, acne, brain fog, fatigue, and irregular periods—all of which impact their social, professional, and personal lives.

PCOS affects 1 in 10 women in the UK, yet no two cases look the same.

Because of this, there is no single “PCOS diet” that works for everyone. The key to managing PCOS is creating a tailored diet plan for PCOS that addresses your unique symptoms, metabolism, and lifestyle.
At Third Sister, we focus on science-backed, personalised nutrition strategies to help you feel in control of your body again—without crash diets, misinformation, or frustration.

Our approach:

How We Support You

Clients of Third Sister in discussion with Clementine Vaughan, founder and registered dietitian
For most clients I work with, the first feeling is relief—relief that someone is finally taking them seriously and acknowledging their struggle. Many women with PCOS have been handed generic advice or left to navigate conflicting information alone. I see you, I hear you, and I’m here to help.

PCOS management isn’t one-size-fits-all. I help cut through the misinformation and create a science-backed, personalised plan that actually works for your body. If you're curious about supplements or new interventions, I’ll provide an open, informed perspective so you can make safe, confident decisions.

Sustainable changes don’t happen overnight, which is why we work together over time—adjusting, refining, and building habits that last. My goal is to help you feel in control of your health, not stuck in a cycle of frustration.

What you'll get:

Online and In-Person Dietitian Consultations​

Whether you’re local to London or based elsewhere, Third Sister offers flexible options to fit your lifestyle. Our consultations are available online and in-person. Both options provide the same high level of care and support, ensuring you receive expert guidance wherever you are:

In-person

At convenient locations across Fulham, Kensington, and the City of London

Online

Via secure Practice Better video calls

Online and In-Person Dietitian Consultations​

Whether you’re local to London or based elsewhere, Third Sister offers flexible options to fit your lifestyle. Our consultations are available online and in-person. Both options provide the same high level of care and support, ensuring you receive expert guidance wherever you are:

In-person

At convenient locations across Fulham, Kensington, and the City of London

Online

Via secure Practice Better video calls

Struggling to manage symptoms on your own? Learn why working with a specialist PCOS dietitian or nutritionist can make all the difference: