Low knowledge of physical health behaviours is associated with poor diet and chronic illness in adults.

Governments invest heavily in health promotion strategies to improve physical health behaviours. However, the dietary and physical activity practices of many Australians fail to meet minimum levels for health, leading to the unacceptably high prevalence of chronic and complex illness. Health literacy is known to impact on health behaviour, and to be related to health knowledge; however, no studies have specifically examined knowledge of physical health behaviours in an Australian context. We assessed knowledge of physical health behaviours in 1244 adults in Queensland, Australia. Almost two-thirds of respondents had a 'Good' knowledge of physical health behaviour. People with 'Good' knowledge of physical health behaviours were more likely to be female, educated beyond secondary school, be employed and have an annual household income of >$52000 (PP<0.05). Binary logistic regression shows low daily intake of vegetables to have the strongest association with low knowledge of physical health behaviours. Given the association between health knowledge and health literacy, assessment of the knowledge of physical health behaviours may provide considerable insight into the effectiveness of future health promotion interventions.