Table 2.

Areas of expertise of potential participants contacted in initial recruitment efforts

Stakeholder Type	Area of expertise
Policy experts	Regulatory bodies
	Policymakers
	Semi-official policymakers
	Third sector/charities
	Academics
Commercial experts	Food and drinks industry
	Trade associations
	Retail sector
	Advertising industry
	Social media influencers
	CRUK corporate partners
	Broadcasters and internet platforms
Advocacy experts	Stigma community
	Poverty and inequalities
	People who work with children and young people
	Food and health journalists