aadoyle,
To each his own. One of the "bothers" that I was referring to is that mentioned by
Bealzebub, numerous countries prohibit the inward carriage of foodstuffs, that's a bother if you want to take any with you on a stopover. There's also the personal safety issue of your food cooking inside your Nav bag during the 3 hour delay, the 'bother' of hastily preparing your own food for a quick call-out, etc. By all means bring your own food, there's no restriction by the airlines.
Personally, I enjoy to the max the culinary differences available in the many countries that I visit, never, never, looking for my own native (Western) food. Some of the F/Os that I fly with have a lot of 'bother' in eating overseas, for 1 example I fly with a number of Muslim pilots and they always have the bother to find Halal food, not always easy.
Personally, I eat anything EXCEPT American fast food, that's my choice, and you have yours. In 57 years the only health problem that I've suffered despite my omnivorous eating habits is in-grown toenails.
It's not an issue, just a bother.
Regards,
Old Smokey