Rocket Fizz isn’t just a candy store – it’s a pilgrimage site for sugar enthusiasts throughout Illinois who willingly brave traffic on I-88 for a taste of childhood wrapped in colorful wax paper.

The peanut butter variety, for example, is made from just dates, peanut butter, whey protein isolate (a concentrated form of milk protein) and peanuts. Each packet contains six balls and adds 10g ...