[brookst]

If I'm understanding you correctly, the concern is that someone who has e.g. a peanut allergy will eat product A which is labeled as containing peanuts despite not having any, and then decide they must not be allergic so they can eat product B which is also labeled as containing peanuts but actually has them, and have a bad outcome?

This seems a stretch. If the person is eating food labeled as containing an allergen, do we really care whether it is product A or B that produces the bad outcome?

[dboreham]

Disagree. There's a concept of people "growing out of allergies". I think it's at least plausible someone could eat product A without checking the label, then subsequently read the label and assume "well I must have grown out of that allergy" and hence proceed to eat product B.

[zeroonetwothree]

Allergies depend on the dose so I don’t think most people would think like this.