Unfortunately true. Pretty much all of the named ingredient food colorings are that way because someone somewhere reacts to them. Red M&Ms are a new thing. They went away in the 80's because that color turned out to be carcinogenic, so we had no red M&Ms for a decade or two, and then if memory serves they introduced blue first, which I think was probably a way to clear everyone's memories a bit more.
I had a friend who had avoided M&Ms for all of grade school because she was allergic to the old Red. I think it was a year or two after they phased it out before she learned they were safe for her to eat again. She was not pleased nobody told her.
The yellow #5 thing is apparently somewhat common for ADHD people, I'm not sure about people on the spectrum. It does give some credence to the old wives' tale about candy making children spaz out, beyond the generally accepted theory today about correlation with overstimulation. Some kids, and some candies, just enough to cause anecdotes to circulate.
I had a friend who had avoided M&Ms for all of grade school because she was allergic to the old Red. I think it was a year or two after they phased it out before she learned they were safe for her to eat again. She was not pleased nobody told her.
The yellow #5 thing is apparently somewhat common for ADHD people, I'm not sure about people on the spectrum. It does give some credence to the old wives' tale about candy making children spaz out, beyond the generally accepted theory today about correlation with overstimulation. Some kids, and some candies, just enough to cause anecdotes to circulate.
https://www.webmd.com/diet/what-to-know-yellow-5-food-dye