theres mentions of stuff like a character getting an erection but its not written in a way thats "sexy", so id say no minors are sexualized but there are sexual themes
if you're sensitive to people talking about eating, hunger, not having enough food, pica, calories, consuming, dwelling on food, hunger then don't read this book it's a lot of food themes
Max, traumatized by what he’s seen, deliberately heads back to the island as he senses a deep hunger inside of him. Whether this is a sign that he’s been infected or is merely imagining symptoms (as the ending also makes it clear that he shows no signs of infection) is unclear and left to interpretation.