In March 2021, Mei Li shared a post on her Instagram page reflecting on Neurodiversity day. The actor explained that she was diagnosed with ADHD at age 24, and that the diagnosis "answered many life long questions, and I feel like I'm finally understanding myself."
She also spoke about her experience in an interview with The Guardian the following month, explaining that "[the diagnosis] completely changed how I viewed loads of things in my life, and made me really reconsider the way I think about things." "In the past I was constantly late for things and forgetting things and losing things, and I remember as a teenager, my mum being like, 'Oh, you just need to be more careful.' And I'm like, 'I am really careful,'" she recalled. "I felt like no one believed me ever. People, especially people who've just been diagnosed, go through a grieving period for who they were before. I'd love to be someone they can look at and say, 'OK, that person has been through that as well.'"