For meat, dairy, and eggs, the products in the grocery store almost always come from large-scale confinement operations that feed large quantities of GMO corn and soy. So your best option it to buy from local farmers and ask them what they feed their animals. Optimally, you want to buy from a farmer that raises 100% grass-fed livestock or use non-GMO feed (either grains that have not been genetically engineered, such as barley, oats and wheat, or certified organic feed, or feed tested for GMO contamination).
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WHAT TO BUY? Here are some explanations of the various labels on food:
USDA OrganicNote: USDA Organic products cannot intentionally be made with genetically engineered ingredients. Because of the widespread planting of GMO crops, there may be some level of contamination in organic crops, but it’s much lower than in conventional crops.
NON-GMO Project Verified
Note: Products labeled with the NON-GMO Project seal have been tested for GMO content and have been found to have no more than 0.9% GMOs, the same standard as the European Union.