Health professionals are warning of an "incipient health crisis" following funding cuts to healthy eating and obesity prevention programmes.
The warning came in an open letter to the New Zealand Medical Journal signed by 12 medical specialists, public health researchers and nutritionists.
It said the Government was not doing enough to combat increasing diabetes rates and the axing of programmes such as the Healthy Eating Health Action strategy could lead to a health crisis.
An increase in the number of people suffering from diabetes could largely be attributed to rising obesity rates, the letter said.
Between 1989 and 1997 the average weight gain in adults was 3.2kg.