For me, it has to be the UK since British food tends to be heavily processed along with a fixation on fish & chips, bangers & mash, pies and pastries with high fat content (most feature at least a fried item beside them, whether it’s an English breakfast with a hash brown) but not on the level of unhealthy to that from American cuisine.
Subjective as dependent on person. A person who is undernourished will need different food from someone who is overnourished. Allergies and intolerances play their part. I didn’t intend to claim that healthy food is not based in material reality.