I have been researching all of the possible causes of food allergies, digestive problems, infertility, autism, etc. One common thread that all researchers point their finger to is genetically modified food. It was introduced into the food supply in the mid 1990's. Since then, autism and food allergies have skyrocketed. Digestive disorders and infertility have also dramatically increased.
Over the past two decades, scientists have genetically modified the DNA of soy, corn, cottonseed, canola, tomatoes, potatoes, squash, carrots, sugar beets, papaya, wheat, rice, and milk and dairy products. These products have been available in our supermarkets since 1996, but here is the kicker: they are not labeled!
I won't get into the science of why GM foods are bad for you, but there is an excellent overview in the book "Dangerous or Safe? Which Foods, Medicines, and Chemicals Really Put Your Kids at Risk" by Cara Natterson, MD. Here are some interesting links...
GMO health risks
GM corn kills monarch butterflies
GMO defensive shopping list
GMO corn linked to organ failure
GM foods can lower your fertility
55% of offspring of rats fed GM soy died
GM foods can change the DNA of our gut bacteria
GM foods may cause rise in food allergies
To avoid GM foods you have to buy organic or foods labeled as no-GMO's. Kettle brand potato chips do not use GM ingredients, they are the only ones that I buy.