Yes, you do. Genetic Engineering (GE) or Genetically Modified Organisms (GMO) is the laboratory process of artificial insertion of genes into the DNA of food crops and animals. Read that again and think about it. What that means is that in a lab, food scientists alter natural food. Once it is altered, it really isn't food anymore or is it?
Labeling is such that food manufacturers and marketeers don't have to reveal everything related to the use of GMO ingredients in food processing. Your best bet is to avoid Genetically Modified crops and the products that are made from those crops
Here are a few tips from the Non-GMO Shopping Guide provided by the Center for Safety.

1. Buy Organic - 100% Organic, Organic, or Made with Organic Ingredients means that these products are not allowed to have any GMO ingredients.
2. Look for "Non-GMO" Labels - Companies may choose to use the Non-GMO label
3. Avoid At-Risk Ingredients - Avoid products made with any of the crops that are GM. Most GM products are made from corn, soybeans, canola, and cottonseed. These four crops are the foundation of most processed foods. The most common GM ingredients are: corn flour, meal, oil, starch, gluten, and syrup, fructose, dextrose, glucose, modified food starch, soy flour, lecithin, soy protein, isolate, isoflavone, vegetable oil, canola oil, rapeseed oil, and cottonseed oil.
4. Download a free copy of the Non-GMO Shopping Guide provided by the Center for Safety. Use it when you shop. After a few trips to the grocery store, the Farmer's Market, Good Earth, Harris Teeter, and wherever else you shop, you'll know which foods are best for you and your family.