Modified starch is one of the most common food additives you will encounter on ingredient labels. It is used to thicken, stabilize, and emulsify everything from jarred sauces to bottled dressings. But the term “modified” raises red flags for many people on a gluten free diet.

The confusion is understandable. Modified food starch can be derived from several different sources, and not all of them are gluten free. Here is what the science and labeling laws actually say.

Is Modified Starch Gluten Free

In most cases, yes, modified starch is gluten free, especially in North America. The most common sources for modified food starch in the United States are corn, waxy maize, potato, and tapioca, all of which are naturally gluten free. However, modified food starch can also be made from wheat.

According to Beyond Celiac and the National Celiac Association, if a product manufactured in North America lists “modified food starch” without mentioning wheat, the starch should be safe to eat. Under the Food Allergen Labeling and Consumer Protection Act (FALCPA), wheat must be declared on the label whenever it is used as an ingredient.

How to Tell if Modified Food Starch Contains Wheat

If modified food starch is derived from wheat, it must be disclosed on FDA-regulated food labels in one of two ways. It will either appear as “modified wheat starch” or “modified food starch (wheat)” in the ingredients list, or wheat will be called out in a separate “Contains” statement.

Importantly, rye and barley are not used as starches in food manufacturing, so you do not need to worry about those grains in relation to modified food starch. Some wheat starch has been specially processed to remove most gluten protein, and products containing such starch must include a specific FDA disclosure statement.

The GMO and Processing Concern

The word “modified” does not mean genetically modified in this context. It refers to physical, enzymatic, or chemical alteration of the starch to change its properties. That said, some modified food starches are likely made from genetically modified ingredients, particularly corn.

Modified food starch is found almost exclusively in processed and packaged foods. It extends shelf life and improves texture, but it is not an ingredient you would typically use in whole-food cooking. Some nutrition experts recommend limiting intake of modified food starch regardless of gluten content, simply because it is a marker of highly processed food.

Special Cases: USDA Foods and Medications

There is an important caveat for foods regulated by the USDA rather than the FDA. Processed foods containing more than 3% raw meat or 2% cooked meat or poultry fall under USDA jurisdiction, and USDA-regulated products are not required to comply with FALCPA allergen labeling rules. In these cases, modified food starch could potentially be from wheat without clear disclosure.

Medications present a similar challenge. Drug manufacturers are not required to disclose the top allergens on their labels. While the FDA notes it is rare for medications to contain gluten, if you spot modified food starch in a medication, contact the manufacturer or your pharmacist for clarification.

Trusted Gluten Free Starch Brands

For home cooking, several brands offer verified gluten free cornstarch options. Hodgson Mill produces only gluten free products with less than 5 parts per million of gluten. Bob’s Red Mill uses dedicated gluten free equipment and tests products to confirm they contain fewer than 20 ppm of gluten, the FDA threshold for gluten free labeling.

When shopping for packaged foods containing modified food starch, always look for a certified gluten free logo for extra assurance. The 20 ppm standard is widely recognized as safe for people with celiac disease.

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