We are often given the advice to eat more plant-based foods for our health and the environment. On the back of this we've seen a huge influx of meat substitutes on the supermarket shelves - but how healthy are they? A study published this week set out to measure the nutritional and cost value of meat alternatives, and found that not all meat-free meals are equal. Dr Leanne Young, from the Faculty of Medical and Health Sciences at the University of Auckland is one of the researchers behind the study and joins Susie to share her findings.