How do you know where it is? In the US, the four foods most likely to contain genes that nature didn't intend are corn, soy, canola and cotton. Most autistic children have allergies to both corn and soy. Soy and canola have been heavily marketed as "health food" and many people are still convinced that "low carb" foods containing soy lecithin and canola oil are parts of a healthy diet. Corn has become an ingredient is almost all processed foods, in the form of high fructose corn syrup and other corn derivatives. And cotton seed oil is another cheap filler ingredient that is ubiquitous. So basically any multi-ingredient food from the grocery store is likely to contain genetically modified ingredients.

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