Is Popcorn Gluten-Free?
Popcorn starts as a naturally gluten-free grain, so plain kernels are usually straightforward. The details matter when oils, seasonings or shared equipment enter the picture.
Plain popcorn starts gluten-free
Popcorn is a type of maize, and maize does not naturally contain gluten. Air-popped kernels or kernels cooked with a simple oil are therefore generally gluten-free.

This does not mean every popcorn product is automatically suitable. Added ingredients and the way the popcorn is handled can introduce gluten after the kernels leave the field.
Check flavoured and packaged varieties
Sweet, savoury and coated popcorn may contain more than maize, oil and salt. Seasoning blends, coatings and flavour carriers can include gluten-containing ingredients, so read the full ingredient list rather than relying on the flavour name.

A clear gluten-free label provides more useful reassurance than assumptions based on the front of the pack. Check the label again when buying a familiar product, as recipes and manufacturing arrangements can change.
Preparation can affect the answer
Popcorn made in cinemas, cafés or shared kitchens may come into contact with crumbs, utensils, scoops or surfaces used for gluten-containing foods. Toppings and seasoning dispensers can be another source of cross-contact.

If you need to avoid gluten strictly, ask how the popcorn is prepared and whether ingredients or equipment are shared. When the answer is unclear, plain kernels prepared with clean equipment give you more control.
Tracking popcorn in your food diary
When logging popcorn, choose an entry that matches how it was prepared. Plain air-popped popcorn, oil-popped popcorn and heavily coated popcorn can have very different energy and nutrient values even when the serving looks similar.

Record the amount you actually eat and include oil, butter-style toppings, sugar or seasoning where relevant. The exact quantity depends on the product and portion, so use the packet information or your measured ingredients rather than a generic estimate.