He's lactose intolerant. This is mainly due to the little milk used in 90% of the Chinese's diets; resulting in many of the population not being able to consume milk in any form,
It's never said to have bothered Yao; this just makes it extremely difficult for him to eat foreign food.
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a p h ; h e a d c a n o n s
RandomHello! Not much to say, so.. ~•Onto the headcanons!•~ (Finished book as of 11/19/18)