Dietary intakes of most young adults aged 18-35 living in Australia, fall short of national dietary guidelines, including low intake of fruits and vegetables and high consumption of highly processed foods. Coinciding with suboptimal diets are a rapid increase in cardiovascular risk factors. Over half of Australians enter their thirties with overweight or obesity and an accelerating burden of hypertension, dyslipidaemia and type 2 diabetes(1). Additionally, early-onset cardiovascular disease in adults under 40 is rising, suggesting decades of lost health and productivity(2). Despite this, young adults remain underserved, with limited public health or primary care programs explicitly targeting this age group. With high smartphone use and widespread engagement with social media, digital platforms offer a promising avenue to deliver scalable, accessible, and engaging tools to support healthy eating in this cohort(3). The Heart Foundation has identified young adulthood (18-35) as a critical window for long-term behaviour change and prevention of cardiovascular disease. Therefore, this project aims to inform the development of a digital food literacy and healthy eating tool that builds practical skills, knowledge, and motivation for heart healthy eating among young adults (18-35) living in Australia. A multi-method consumer research and participatory co-design process was conducted, including a literature review, an online representative sample survey (n = 1000), three online focus groups (n = 20), and a one-day in-person co-design workshop (n = 7). Findings of the literature review, survey and focus group discussions highlighted a range of behavioural, environmental, and psychosocial barriers to healthy eating, including time, cost, motivation, cooking confidence, access, and social influences. Young adults expressed a strong interest in simple, flexible, and practical nutrition support delivered through digital platforms. Tools that reduced decision fatigue, promoted time and money saving, and featured clear, visual content were especially valued. Trust in credible sources, such as the Heart Foundation, and receptiveness to personalisation, snackable content, and goal-driven features were consistent themes. These findings informed the co-design workshop, where participants completed a series of interactive activities to prioritise content, features, and delivery formats for a future digital tool. Outcomes of the co-design workshop confirmed the importance of simplicity, personalisation, and visual appeal, with mobile applications and social media identified as the preferred delivery platform for tailored food and nutrition information for young adults. These insights can inform the design of digital interventions, ensuring they reflect both current evidence and lived experience. Building new accessible tools that address the needs of young adults, empowers them with practical tools, and credible information that can help support healthy behaviours with long-term heart health benefits.