To examine Australian adolescents’ knowledge and beliefs regarding potential health consequences of soda and diet soda consumption and nutritional aspects of soda and explore associations with consumption.

A survey utilising a nationally representative sample (stratified two-stage probability design) assessed knowledge of nutritional contents and health consequences of soda, and beliefs regarding health risks of diet soda, and soda and diet drink consumption.

Australia.

9102 Australian school students (12–17 years) surveyed in 2018.

Adolescents had lower nutritional knowledge (sugar content (22·2 %), exercise equivalent (33·9 %), calories/kJ (3·1 %)) than general knowledge of health risks (87·4 %) and some health effects (71·7–75·6 % for tooth decay, weight gain and diabetes), with lower knowledge of heart disease (56·0 %) and cancer (19·3 %). Beliefs regarding health effects of diet soda were similar, albeit not as high. In general, female sex, older age and less disadvantage were associated with reporting health effects of soda and diet soda, and nutritional knowledge of soda (P < 0·001). Those reporting tooth decay, weight gain, heart disease and diabetes as health effects of soda and diet soda were lower consumers of soda and diet drinks (P < 0·001), as were those with higher nutritional knowledge (sugar content and exercise equivalent; P < 0·001).

This study highlights possible knowledge gaps regarding the health effects of soda and nutritional knowledge for public health intervention. When implementing such interventions, it is important to monitor the extent to which adolescents may consider diet drinks as an alternative beverage given varied beliefs about health consequences and evolving evidence.

There are numerous health effects associated with excess sugar-sweetened beverage (SSB) consumption. Interventions aimed at reducing population-level consumption require understanding of the relevant barriers and facilitators. This study aimed to identify the variables with the strongest relationship with intentions to reduce SSB consumption from a suite of variables derived from the literature.

Random-digit dialling of landline and mobile phones was used to survey adults using computer-assisted telephone interviews. The outcome variable was ‘likelihood of reducing SSB consumption in next 6 months’, and the predictor variables were demographics, SSB attitudes and behaviour, health risk perceptions and social/environmental exposure.

Australia.

A subsample of 1630 regular SSB consumers from a nationally representative sample of 3430 Australian adults (38 % female, 51 % aged 18–45 years, 56 % overweight or obese).

Respondents indicated that they were ‘not at all’ (30·1 %), ‘somewhat’ (43·9 %) and ‘very likely’ (25·3 %) to reduce SSB consumption. Multivariate nominal logistic regressions showed that perceiving future health to be ‘very much’ at risk was the strongest predictor of intention to reduce SSB consumption (OR = 8·1, 95 % CI 1·8, 37·0, P < 0·01). Other significant predictors (P < 0·01) included self-perceptions about too much consumption, habitual consumption, difficulty reducing consumption and likelihood of benefitting from reduced consumption.

Health risk perceptions had the strongest relationship with intentions to reduce consumption. Age and consumption perceptions were also predictors in the multivariate models, whereas social/environmental exposure variables were not. Interventions may seek to incorporate strategies to denormalise consumption practices and increase knowledge about perceived susceptibility to health risks.