
Sonya Martha Maria Douglas
Dietwise
About
At Dietwise we know and understand the confusion trying to navigate conflicting messages around food, nutrition, diet trends and everything in between. We are passionate and skilled in simplifying nutrition and providing the support, help and care you need to achieve your goals, no matter your age, gender, weight, race, religion, neurotype, or health concern. Dietwise specialises in the non-diet approach to weight concerns, dieting, disordered eating and body image issues, and the treatment of eating disorders.
We're proudly fat-positive, weight-neutral and body-inclusive and know that bodies, health, and fitness come in all shapes and sizes.
Approach: Compassionate, evidence-based, non-diet and weight-neutral. Values inclusion, empowerment, compassion, excellence and collaboration. Longer appointments to provide adequate time and space.
Weight Loss Approach
Non-diet approach, Health at Every Size (HAES®), intuitive eating, and weight-neutral philosophy. Clinic is described as fat-positive, weight-neutral and body-inclusive. Also offers support for people on weight loss medications (GLP-1s) with a harm reduction approach.
Yes. Dietwise (via dietitian Georgie Carmichael) provides nutritional support for people at every stage of their GLP-1 medication journey, including starting or weaning off Wegovy®, Ozempic®, Mounjaro® or Saxenda®. Support includes preventing deficiencies, preserving muscle mass, managing side effects, and maintaining long-term health habits to avoid yo-yo dieting and weight cycling.
Yes. Pre and post-bariatric surgery nutrition support is offered, including Sleeve Gastrectomy, Gastric Bypass, Band & Balloon.
Areas of Expertise
Client Reviews
“Sonya and her team are very knowledgeable and focused on a tailored approach to each client. Dietwise Nutrition Clinic created a plan that suits my lifestyle and builds on my existing strengths and desire to change. They have created a welcoming positive environment.”
— Allison Lugert
“Sonya is lovely and very knowledgeable! I really enjoyed talking to her and came out of the meeting with many strategies to address my main concerns. I love that she provided me with evidence-based advice, and challenged me on some of my (not evidence-based) believes and behaviours. I would highly recommend her as a dietitian and professional.”
— Francine Marques
“I saw Eryn who was very professional, warm, helpful, and open to whatever challenge I discussed with her. They also had a dog who wanted to cuddle – so cute. I think Eryn would make you feel safe and help you if you had something you were stressed about discussing.”
— Tiffany Burridge
Location
Qualifications
- APD (Accredited Practising Dietitian)
- Accredited Nutritionist
Memberships
- Dietitians Australia
Rebates & Insurance
Medicare
Medicare provider. Rebates available (e.g. under Chronic Disease Management/EPC plans). Specific rebate amounts not stated.
NDIS
NDIS provider. Plan-managed/self-managed/agency-managed distinctions not specified.
DVA
DVA provider.
Private Health
Private health fund rebates available. Specific funds not listed.
Referral
No referral required. However, if referred by a GP or medical specialist, clients are asked to bring paperwork to the first appointment or email it to reception@dietwise.net.au.
Book a Consultation
Longer appointments are provided to give clients adequate time and space. Specific duration not stated.
Medicare rebate available with GP referral
Other Weight Loss Dietitians in Western Australia
Jessica Lee Ruescher
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IBS and digestive health (Low FODMAP) · Weight management and body confidence · Heart health and cholesterol · Type 2 Diabetes
“APD Jessica Ruescher (15+ yrs exp.) offers kind, evidence-based nutrition support in Fremantle/Perth for weight, gut health, diabetes, cholesterol & more. In-person & telehealth available.”

Shyamala Vishnumohan
The Pregnancy Dietitian
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“Dr Shy is a PhD APD & Certified Prenatal Dietitian in Perth specialising in fertility, pregnancy, GLP-1 & bariatric nutrition support for women. Evidence-based, culturally aware, non-judgmental care.”

Katie Lenhoff
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Rebecca Tippett
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Weight management / Overweight and obesity · Eating disorders · Pre-diabetes / Type 2 Diabetes · Cardiovascular disease / Heart disease
“Bec Tippett is an APD/AN and Credentialed Eating Disorder Clinician at The Medical Nutrition Clinic, North Beach WA, specialising in evidence-based nutrition for weight management, diabetes, gut health, women's health and more.”
Katherine Louise Ireland
Katie Ireland Nutrition Dietetics Food (trading as KINDFood)
Weight management and obesity · Bariatric/weight loss surgery (pre and post-operative) · Weight loss medications support · PCOS (Polycystic Ovarian Syndrome)
“Perth APD Katie Ireland specialises in bariatric surgery, weight loss medications, PCOS, fertility, perimenopause & eating disorders. Non-judgemental, non-diet approach. Medicare, DVA & private health.”

Hio Ian Ip
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Weight management · Type 2 Diabetes · High cholesterol · Underweight / unintentional weight loss / low appetite
“APD Allison Ip holds a Master of Dietetics from Curtin University. She consults across Perth clinics & via telehealth, fluent in English, Cantonese & Mandarin.”