The nonprofit Children & Screens has distilled a lot of research about the impact of digital media usage on body image for kids and teens into a very digestible two-page handout.
It has a succinct infographic on one side and a bunch of bullet points on these topics on page 2 - including citations to research.
- Content Matters
- The Role of Selfies, Filters, and Avatars
- Interventions and Protections
Children and Screens points out that "social media use is closely linked to body dissatisfaction, restricted eating, and low self-esteem, especially during adolescence.[ This handout] distills the latest findings into clear takeaways for parents, educators, and policymakers."
They have more articles and resources about links between body image and screen use.
Children & Screens: The Institute of Digital Media and Child Development is a great source of well-researched and practical information about the impact of digital media on children