UPI: China rejects 60,000 tons of GM corn from the US.

[KurtNYC]

19. Food is ingested so not an environmental toxin per se and ingestion varies from one person to the

next even within one household where it could be assumed that everyone is exposed to the same environmental toxins.

Many health issues have been tied to diet. The Harvard Nurse Study grinds out data year after year and has found all kinds of links which may have been obscure in smaller samples. The nurses in the study report what they eat (among many other things) and that data can be bumped against any and all physical symptoms like allergies, weight gain, heart disease, cholesterol levels. For example they figured out that drinking diet soda leads to weight gain through multivariate analysis.

But something like allergic reaction, birth defects or an endemic condition would be much more obvious and easier to pin down. The CDC is designed to pin point the cause of outbreaks (for example e coli) and if you had a large outbreak of allergic reactions when a new food is introduced they would investigate as they did for the Jack in the Box incident and many others since then.