Something... like an allergy, yes.

[Said purely hypothetical person who is absolutely not Fuyuhiko Kuzuryuu is lactose intolerant, which may contribute to why he's so short? (no.)]

If it's just a little bit, I think it may be okay... but having someone get sick from chocolate is not exactly in keeping with the intent of the holiday.

...I think.

[She's not sure??? That seems pretty obvious!]