BMI between 18.5 to 24.9 is required to have optimal cardiorespiratory fitness because weight directly affects the cardiorespiratory fitness.
Answer: this question is opinionated so I'm just winging it for you-
I would not mind because I don't really want to have kids. If they were upset about it and it was affecting their mental health, I would then in that case feel empathy towards their pain and support them the best I could.