New Zealand is the third fattest nation within the OECD. One in every three adults is obese and 10% of children are either seriously overweight or obese.
Robyn Toomath is an Auckland diabetes specialist who fronted a campaign to end the obesity epidemic for many years, until she gave up last year as a result of her frustration with the lack of action.
She has now written a book called Fat Science and tells Veronika Meduna that unless healthy food options are made more easily available, no diet or exercise, and not even surgery, will stop people from getting fatter.
Veronika also catches up with Andrew Dickson, a Massey university sociologist and long-distance runner, whose body mass index puts him in the obese category.
He describes his experience of being a big athlete and he shares his thoughts on the weight-loss industry.