It's worth trying to analyze a country's food in a sense, and it seems interesting. However, it's just a kind of observation report, not a standard or good criteria to understand a country's culture and international relationship between contries. It's obvious to make influence each other if they are adjacent or they have a history to fight each other, politically or socially.
And it's not a balanced manner to write a country's cuisine culture scorning with his own taste, because a country's cuisine culture stands for the country itself in a sense.
It's not a matter of agree and disagree, it's a matter of comfort and discomfort when reading.
I'd like to pick up the most embarrasubg question rather than the most interesting question.
It's the last one, 'Can food attitudes in different countries be an indicator of future conflicts or resolution of current ones?'
It's because the author seems to do wordplay with food.