Food Additives and Allergies

choi

Roni Caryn Rabin, Food Additives and Allergies; Doctors question whether dyes and preservatives, synthetic or natural, can provoke reactions. New York Times, Nov 14, 2017.
https://www.nytimes.com/2017/11/ ... -food-or-drugs.html
("She eventually consulted Dr Robert Swerlick, an Emory University dermatologist known to take on difficult cases, who reviewed her medical record and suggested that since she was allergic to sulfa drugs, she might also be sensitive to dyes used to color medications")

My comment:
(a) Read only the first 5 1/2 paragraphs.
(b) sulfonamide (medicine)
https://en.wikipedia.org/wiki/Sulfonamide_(medicine)
(dyes)
(c) Though medical reports may be meager, it is firmly established small molecules may cause allergy. The most famous example is penicillin.
https://en.wikipedia.org/wiki/Penicillin
(table: Molar mass 243.26)