We're not alone in being overweight as the rest of the western world is also struggling. 

Health New Zealand's latest review of the state of our health has found one in three adults carries enough weight to affect their health. 

Nutritionist Lillian Morton told Mike Hosking that we all know we need to exercise and eat well to stay healthy, but the reasons we don't do that are complex. 

She says it's generational, and prevention is better than cure, so perhaps we work forwards rather than backwards and choose better messages to prevent people getting obese. 

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• NZ's exercise habits found lacking