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Health experts are warning the current generation of Australian teenagers could be the first with a decline in life expectancy and an increase in heart disease.
The first comprehensive national study of young Australians since 1985 found a quarter are overweight or obese.
Run by the Cancer Council and Heart Foundation, the study of more than 12,000 teenagers also found 85 per cent of respondents are not doing enough exercise.
The survey questioned teenagers at 237 different Australian schools about their diet and exercise habits.