Imagine being the first person to be allowed to travel anywhere in a country where it would normally be restricted because you are a foreigner. It must have been quite a shock to Bird. As for her distaste for Japanese food, recall that this is the 1800's and the dishes then were probably not as refined as the ones we are used to. It would probably have tasted and smelled considerably worse, regardless of their nutrition. Refrigeration wasn't even invented, so you had to eat it as soon as you got it or else it just rotted.