Over the years, certain dyes have raised red flags. One, FD&C Yellow No. 5, listed as tartrazine on some medicine labels and found in dessert powders, custards and some beverages, can cause itching and hives, though in fewer than one out of 10,000 people. Still, safety notwithstanding, the FDA suggests that consumers should avoid taking in huge quantities of any single additive.
Bottom line: Have one maraschino cherry, not 2,000.