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General and nutritional medicine

General and nutritional medicine

Dr. med. univ. Katharina Vafiadis-Maruszczak, MSc, PhD, general practitioner specialising in nutritional medicine at MEDINO in Vienna

Dr. med. univ. Katharina Vafiadis-Maruszczak, MSc, PhD

General practitioner

Focus: nutritional medicine, obesity, diabetes and metabolism

Languages: German, English, Spanish

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About Dr. Vafiadis-Maruszczak

Dr. Katharina Vafiadis-Maruszczak is a general practitioner with a broad, holistic view of the whole person. Alongside medicine, she studied nutritional sciences with a focus on public health.

Her medical focus lies in general and nutritional medicine, obesity and metabolic medicine, and the prevention and treatment of chronic conditions. She combines evidence-based medicine, prevention, nutrition and modern metabolic medicine with an individual, patient-centred approach.

Her aim is not only to treat illness, but to recognise its causes and risk factors early and to develop lasting solutions together with her patients.

She is currently completing her training in internal medicine in Vienna, with a focus on endocrinology, metabolism and diabetes. Her research has long centred on obesity, fatty liver disease and glucagon metabolism – including at Paracelsus Medical University in Salzburg, where she completed her PhD in 2025.

“Being a doctor is the most beautiful and the most difficult profession on earth. It demands everything: the whole person, the mind, the heart, devotion.” – Paracelsus (1493–1541)

Special interests

Her main areas at a glance:

  • General practice
  • Preventive medicine
  • Nutritional medicine
  • Obesity
  • Type 1 and type 2 diabetes, gestational diabetes

Services

  • Obesity consultation and follow-up
  • Diabetes consultation
  • Nutritional medicine consultation
  • Liver fasting – medically supervised 10-day programme
  • General medical first consultation and follow-up
  • Acute appointments for adults
  • Vaccinations for adults
  • Blood tests for laboratory analysis

Professional experience & training

since March 2024 – Vienna – Training in internal medicine, focus on endocrinology, metabolism and diabetes

April 2021 – Feb. 2024 – LKH Korneuburg/Stockerau – Training in general medicine, licence to practise independently (jus practicandi)

July 2020 – March 2021 – LKH Korneuburg/Stockerau – Foundation training: internal medicine, urology, surgery

Oct. 2019 – June 2025 – Paracelsus Medical University, Salzburg – PhD in Medical Science

since Sept. 2019 – Salzburg University Hospital (SALK) / Paracelsus Medical University – Research associate, paediatric gastroenterology, hepatology and nutrition

since Sept. 2017 – Paracelsus Medical University, Institute for Obesity Research – Research associate

Sept. 2016 – July 2019 – Karl Landsteiner University, Krems – Medicine, Dr. med. univ.

Oct. 2013 – Sept. 2016 – Karl Landsteiner University, Krems – BSc Health Sciences

May 2012 – April 2016 – University of Vienna – MSc Public Health Nutrition

Aug. 2010 – March 2011 – Universidad de Valencia – Erasmus exchange programme

Oct. 2006 – May 2012 – University of Vienna – BSc Nutritional Sciences

1992 – 2006 – Vienna International School – International Baccalaureate (IB) Diploma

Additional diplomas, roles and memberships

Nutritional medicine

Emergency physician

Clinical investigator

Sports nutrition adviser

Liver fasting (BodyMed)

2020 – 2024 Member of the Ethics Committee for the Province of Salzburg

Publications

A selection from 22 scientific publications on obesity, fatty liver disease and glucagon metabolism:

  • Maruszczak K, Koren P, Radzikowski K, Pixner T, Suppli MP, Wewer Albrechtsen NJ, Weghuber D, Torbahn G. Glucagon, Metabolic Dysfunction-Associated Steatotic Liver Disease and Amino Acids in Humans and Animals without Diabetes Mellitus – An Evidence Map. Life (Basel). 2024;14(10):1292.
  • NCD Risk Factor Collaboration (NCD-RisC). Worldwide trends in underweight and obesity from 1990 to 2022: a pooled analysis of 3663 population-representative studies with 222 million children, adolescents, and adults. Lancet. 2024;403(10431):1027–1050.
  • Maruszczak K, Meinitzer A, Pereira B, et al. Hepatic insulin resistance mediates the relationship of glucagon and branched chain amino acids stronger than liver fat content in adolescents without diabetes. Current Trends in Endocrinology. 2024:87–101.
  • NCD Risk Factor Collaboration (NCD-RisC). Diminishing benefits of urban living for children and adolescents’ growth and development. Nature. 2023;615(7954):874–883.
  • Pixner T, Stummer N, Schneider AM, … Maruszczak K. The relationship between glucose and the liver-alpha cell axis – A systematic review. Front Endocrinol (Lausanne). 2023;13:1061682.
  • Maruszczak K, Radzikowski K, Schütz S, et al. Determinants of hyperglucagonemia in pediatric non-alcoholic fatty liver disease. Front Endocrinol (Lausanne). 2022;13:1004128.
  • Maruszczak K, Rasmussen C, Ceutz FR, et al. Arginine-induced glucagon secretion and glucagon-induced enhancement of amino acid catabolism are not influenced by ambient glucose levels in mice. Am J Physiol Endocrinol Metab. 2022;323(3):E207–E214.
  • Gomahr J, Julian V, Thivel D, Maruszczak K, Schneider AM, Weghuber D. Childhood obesity prevention: what can be achieved? Curr Opin Clin Nutr Metab Care. 2022;25(3):223–231.

She also contributed to the Austrian reports of the WHO Childhood Obesity Surveillance Initiative (COSI) 2017 and 2021 and has given talks at congresses of the American Diabetes Association and the European Childhood Obesity Group.

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Frequently asked questions

What happens in the obesity consultation?
At the first appointment, Dr. Vafiadis-Maruszczak takes 45 minutes to go through your medical history, eating habits, physical activity, related conditions and previous attempts to lose weight. Blood for laboratory tests can be taken directly at MEDINO. The result is a treatment plan with realistic goals, which is reviewed and adjusted at follow-up appointments.
Who is the diabetes consultation for?
For people with type 1 or type 2 diabetes, with gestational diabetes and for anyone whose blood sugar levels are already raised. The consultation covers your readings, your treatment, your diet and everyday life with the condition. Follow-up appointments monitor your progress.
What is a nutritional medicine consultation?
A medical consultation that looks at nutrition in the context of your test results and conditions – for example overweight, diabetes, fatty liver disease or raised blood lipids. The aim is recommendations that are medically sound and practical in everyday life.
What is liver fasting?
Liver fasting is a medically supervised 10-day programme based on the BodyMed concept. It aims to reduce liver fat. Whether the programme is suitable for you is assessed by a doctor beforehand – for example if you take blood-sugar-lowering medication.
Can I also come with general medical concerns?
Yes. Dr. Vafiadis-Maruszczak is a general practitioner and also offers first consultations, follow-up appointments, acute appointments for adults and vaccinations at MEDINO.
How do I make an appointment?
You can book online through the appointment booking on medino.at or by telephone on +43 1 226 5567.
Do I need a referral?
No. As a private practice you can book an appointment without a referral. Please bring any existing findings with you; that avoids repeat examinations.
What should I bring to the first appointment?
All existing test results and laboratory values, for diabetes your blood sugar diary or sensor data, a list of your medication and your e-card.
Where is the practice?
The practice is at the MEDINO Medical Centre, Auerspergstrasse 6, 1010 Vienna – two minutes’ walk from the Rathaus, with the U2 Rathaus and several tram lines close by.
Which languages does Dr. Vafiadis-Maruszczak speak?
German, English and Spanish.
What does „Wahlarzt“ mean – and will I get the costs back?
MEDINO is a private practice (Wahlarztordination), so there is no direct contract with the statutory health insurers. You pay the fee yourself and can then submit the invoice to your insurer. What is reimbursed is decided by the fund.

MEDINO – one address for prevention, diagnostics and therapy

At the MEDINO Medical Centre, doctors from numerous specialties hold their consultations – on a freelance basis and in their own practice. Examination, laboratory and therapy are right next to one another, complemented by independently practising therapists.

Short distancesFindings, second opinion and therapy without a trip across the city.

Coordination in the buildingWhere it makes medical sense and you agree to it, the treating doctors coordinate directly with one another.

Wahlarzt careFlexible appointments and short waiting times.

Specialties represented

  • General medicine
  • Cardiology and internal medicine
  • Thyroid and nuclear medicine
  • Gynaecology
  • Urology
  • Fertility
  • Pregnancy and obstetrics
  • Paediatric and adolescent medicine
  • Psychiatry
  • Oncological prevention and supportive therapy

Therapies represented

  • Pelvic floor training
  • Occupational therapy
  • Nutritional counselling
  • Midwifery care
  • Speech therapy
  • Osteopathy
  • Physiotherapy
  • Psychotherapy

In-house practice laboratory
A small blood count, urine analysis and CRP are determined directly on site – the results are available immediately. All further parameters are processed promptly by an external institute.

Approved by Daniel Tourou on 21 September 2026