Although web-based interventions are attractive to researchers and users, the evidence about their effectiveness in the promotion of health behaviour change is still limited. Our aim was to review the effectiveness of web-based interventions used in health behavioural change in adolescents regarding physical activity, eating habits, tobacco and alcohol use, sexual behaviour, and quality of sleep. Studies published from 2016 till the search was run (May-to-June 2021) were included if they were experimental or quasi-experimental studies, pre-post-test studies, clinical trials, or randomized controlled trials evaluating the effectiveness of web-based intervention in promoting behaviour change in adolescents regarding those health behaviours. The risk of bias assessment was performed by using the Effective Public Health Practice Project (EPHPP)—Quality Assessment Tool for Quantitative Studies. Fourteen studies were included. Most were in a school setting, non-probabilistic and relatively small samples. All had a short length of follow-up and were theory driven. Thirteen showed significant positive findings to support web-based interventions’ effectiveness in promoting health behaviour change among adolescents but were classified as low evidence quality. Although this review shows that web-based interventions may contribute to health behaviour change among adolescents, these findings rely on low-quality evidence, so it is urgent to test these interventions in larger controlled trials with long-term maintenance.

O aumento da longevidade humana veio acompanhado de uma maior preocupação com os hábitos alimentares e de uma banalização das dietas prescritas, favorecendo um contexto de medicalização da comida, no qual a fronteira entre alimento e medicamento fica imprecisa. Isto tem sido usado mercadologicamente pelas indústrias alimentícias, farmacêuticas e de suplementos alimentares. Este artigo visa discutir como o ecossistema publicitário contemporâneo e a ciberpublicidade são utilizados para naturalizar a presença de suplementos e medicamentos na dieta cotidiana. Usou-se como estudo de caso uma campanha publicitária vietnamita, em que um comprimido foi posicionado como ingrediente culinário. A partir de outros casos descritos na literatura, discutem-se os resultados encontrados no contexto ocidental. Nas considerações finais, apresentam-se alguns desafios regulatórios; apontam-se perspectivas para pesquisas futuras; e defende-se a educação como elemento fundamental para a construção de uma sociedade em que a saúde seja valorizada e exigida como bem coletivo e direito de todos.