Maltodextrin is a white powder made by partially breaking down starch — usually corn, but sometimes rice, potato, or wheat. It's used as a thickener, filler, and texture agent in everything from "sugar-free" powders and spice blends to chips, instant puddings, and sports drinks. The FDA classifies maltodextrin as GRAS. Chemically it's a chain of glucose molecules — technically a complex carbohydrate, not a sugar — which is why it doesn't show up on the "Added Sugars" line of the Nutrition Facts panel.
That labeling gap is the catch parents should understand. Even though maltodextrin isn't counted as sugar, it has a glycemic index around 85–105 — as high as or higher than table sugar (about 65). It's digested very quickly into glucose, so a product sweetened or bulked with maltodextrin can spike a child's blood sugar much like a sugary snack would, without adding a single gram to the "added sugar" number. For a "0g added sugar" product that still tastes sweet or lists maltodextrin high in the ingredients, this is worth noticing.
For kids, maltodextrin isn't a safety alarm — it's a "read past the sugar line" flag. It's most relevant in two situations: "sugar-free" or "keto" products that use it as a bulking agent, and highly processed snacks where it signals ultra-processing. There's also some early research on maltodextrin and gut bacteria, but the clinical significance in children is unsettled. The bigger day-to-day point is glycemic impact hiding behind a clean-looking Added Sugars line.
How to spot it on a label: "Maltodextrin," "maltodextrin (corn)," or occasionally "modified food starch" family ingredients nearby. It's common in chips and cheese-flavored snacks, instant pudding and drink mixes, artificial-sweetener packets (as a bulking carrier), and some sports and "recovery" drinks. If you're using the Added Sugars line to judge a product, glance at whether maltodextrin sits near the top of the ingredient list too.