Catherine Day (Cath Day) holds a BSc (Medical) (Honours) degree in both Medical Physiology and Nutrition and Dietetics from the University of Stellenbosch and University of Cape Town respectively. Through correspondence she is currently enrolled for a postgraduate degree in Lactation Consultancy at the University of Witwatersrand.
She has worked in the public sector in Johannesburg as a clinical dietitian (neonatal ICU, adult surgical wards, burns unit and diabetes, hypertension and weight management clinics). In 2012 she moved back to Cape Town to lecture post-graduate students in Nutrition and Dietetics and currently still does so, 3 days of the week. She is also involved in various research projects (child development and weight management, adults and adolescents) at the Division of Human Nutrition, University of Cape Town.