Dietwise Nutrition Clinics is a leading private nutrition clinic in Perth. We deliver positive health outcomes through the latest evidence-based practice and over 30 years of experience. Our passionate and dedicated team of Dietitians pride themselves in offering a premium service and reject the "one-diet-fits-all" approach. We have the time to care, support, understand, coach, motivate and fine-tune. This approach enables us to treat the whole person with kindness, compassion, sensitivity and respect. 


The APD credential is a public guarantee of nutrition and dietetic expertise.


Our Team at Dietwise are all Accredited Practising Dietitians (APD's) and Nutritionists, and members of the Australian governing body, Dietitians Australia.

Sonya Douglas

Founder & Accredited Practising Dietitian and Nutritionist

Sonya is a leading Accredited Practising Dietitian and Nutritionist with over 30 years of experience. She is the founder of Dietwise Nutrition Clinics, one of Perth’s premium nutrition clinics and is former Head of Dietetics and Nutrition at Sir Charles Gairdner Hospital. She is a guest lecturer at universities including Curtin and Notre Dame and has consulted widely with the corporate sector including BHP, DÔME and RAC.

Sonya’s mission is to help her clients optimise health and wellbeing by harnessing the power of nutrition as a first step towards self-care. She believes tuning back into the body’s inner wisdom is the key to truly nourish the body and unlock the secret to discovering food and body peace. She is a mum of 4 boys and her Italian heritage explains her passionate approach in using food not only as medicine but as a means to feed, fuel, repair, renourish, connect and bring joy.

After working in several private practices across Perth, Kahlia has joined the team at Dietwise. Kahlia has experience in a range of areas including bariatric surgery, IBS, food intolerances, coeliac disease, cardiovascular health, iron deficiency, vegetarianism and veganism. She has a keen interest in women’s health and fertility and is passionate about helping women feel confident about their food choices and fearless in their own bodies. Throughout her studies, she also conducted research on breastfeeding and alcohol consumption at the Telethon Institute for Kids.


Prior to her career in nutrition, Kahlia worked extensively with adolescents with Autism, ADHD and Dyslexia. Throughout this time, she became highly sought after as her passion for supporting learning and gentle-mannered teaching helped her students thrive and fulfil their academic goals. Food was the love language of her childhood home and this has led her towards a lifelong career path in nutrition. 

Kahlia Pryce

Accredited Practising Dietitian and Nutritionist

Katherine has worked in a diverse range of roles providing medical nutrition therapy across the community and acute care settings for both adults and children. As a result, she is highly skilled in translating the science of evidence-based nutrition into practical easy to understand and personalised meal plans for her patients to optimise their health and goals of care.


She has extensive experience and high-level clinical skills in complex chronic diseases, disordered eating, eating disorders, obesity and GI issues. As a result, Katherine was assigned a specialised role of Eating Disorder Liaison Clinician to educate GPs and other health professionals regarding eating disorder management including the transition from acute to community services and screening. This unique role is a testament to Katherine’s depth and breadth of clinical expertise and competency. In 2020 Katherine returned to university to complete further studies and is currently in her 2nd year of a post-graduate Medical Degree at Notre Dame University. As a result of her medical studies, Katherine’s is an asset to the Dietwise team. 

Katherine Espersen

Accredited Practising Dietitian and Nutritionist


Dietwise Dog

Ella is our resident 4 yr old German Shorthaired Pointer at Dietwise Nutrition Clinics. Ella attends all suitable appointments providing affection, comfort and support to our patients when required. She is very calm, gentle and friendly to strangers and is often used in mealtime support sessions for our patients with eating disorders. This is invaluable in our therapeutic work with patients who may experience increased anxiety and distress at appointments.