You have no idea how much worse corporate fast food is over there. I was shocked. McD's is terrible, BK goes from near excellent to extremely average and KFC tastes funky. Their Wendy's are better than ours used to be, though. Never go to Whitecastle, btw... shit is just dowright revolting.
These brands are all pretty decent throughout Europe, it was so surprising how much worse they were when visiting. Great food trucks and street food in general, though, top notch stuff.
My experience is limited to the Northeast, however, so maybe things are different Pacific side, the Northwestern states seem to have their shit together when it comes to their standards, so I wouldn't be surprised.
Some are just more sensitive. I've never had diarrhea ever in my entire life and have only vomitted 4 times (all alcohol related) and I enjoy eating the most brutal and intense crap I can find on a regular basis and have admittedly pretty bad dietary habits on weekends. Some bodies handle certain types of things better, that's all it comes down to. My whole family got salmonella poisining, everyone else was living a nightmare, all it gave me was heartburn and bad breath and I had the most eggs from the batch.
A close friend is the opposite, though, so I've seen how real shit can get pretty frequently.
I hope you feel better OP. That's weird though, Subway would be the last of the fast-food / junk-food outlets that I'd consider to be vomit worthy. That said, I'm from Australia so our corporate food standards on businesses might be different.
We had a subway in the plaza I worked at like 12 years ago, I ate there maybe once a week - always the turkey sandwich. Took close to two years, but it finally hit me and got me puking/diarrhea for a good night.
I didn't touch it for probably 6mo after that, at least. At which point I probably returned to averaging once a week again. Anyway the food is far from great but it's definitely at least good. Still like the turkey and the steak and cheese will always be my favorite! But if Jimmy John's was closer I'd honestly never go.
Subways definitely differ depending on the country they're in. In a lot of their Asian stores they just put a tiny sprinkling of the veggies you choose onto your subway and they turn you down if you ask for more.
Greedy bastards will do whatever they can get away with depending on what culture they're in, that's probably why the American ones taste worse as well.
Never had any issues with Subway over here in the UK. The restaurants are always clean, the staff are acceptable, and the food tastes fine. I only really ever have a meatball marinara on hearty Italian, and they never fail to fill me up. Ive never had the shits or puked my guts up as a result.
Eating fresh, healthy, green and non-processed is in now but it wasnt too long ago that it wasnt and fast food courts only had the New York Fries, A&Ws, KFCs etc... back then Subway really was one of the more healthier eating options at the time.
Then we found out their bread contained the same plastic resin preservative thats found in yoga mats.