Eating disorders are mentioned a couple of times. Nothing explicit but it crops up enough that I thought I'd tag it. Pedophilia is only mentioned once, but the way it's done is rather shocking so again I thought I'd add it. Spoilers:

Hugo describes how Kit destroyed another family in the past before coming into the MC's life. He groomed and had an affair(? It's not quite made clear exactly what relation it was, but was definitely romantic and possibly sexual) with a 12 year old. This reveal comes right at the end of the explanation, with the story before suggesting that it was an older girl and the parents who freak out were overreacting to their child having a relationship with Kit.