When my daughter was diagnosed with celiac, I started reading labels for gluten. That habit turned into reading labels for everything else too. I remember holding a package that listed "sugar" and "vegetable oil" and realizing I had no idea which crops those ingredients came from. If you want to avoid genetically modified crops, the starting list is short. The challenge is that those few crops show up in many packaged foods under names that do not sound like corn or soy.

What GMO means here

A GMO, or genetically modified organism, is a plant or animal whose DNA has been changed in a lab. In the United States, most genetically modified acres are planted with a small group of crops. According to USDA adoption data, corn, soybeans, cotton, canola, sugar beets, and alfalfa dominate the list. Hawaiian papaya, some summer squash, some potatoes, and a few apples also have genetically modified versions.

I'm not a farmer or a scientist. I'm a mom who reads labels, and this is the list I use. I'm not here to argue whether GMO crops are safe. I care about knowing which crops are involved, because you can't make an informed choice if the label doesn't tell you.

The crops to know

• Corn and soybeans. USDA data shows the genetically engineered share of planted acres for both crops has been above 90 percent for years. That means if a processed food lists corn or soy derivatives and isn't organic, it usually came from a genetically modified crop. Corn is everywhere. Soy is nearly as common.
• Canola and sugar beets. These follow the same pattern. Most canola grown for oil is genetically modified, and most US sugar beets are too. Canola oil often hides inside "vegetable oil" on a label. Sugar from sugar beets often hides behind the word "sugar."
• Cotton. Most cotton is genetically modified. Cottonseed oil is a less visible ingredient, but it appears in some fried snacks, crackers, and shelf-stable foods.
• Alfalfa. This one is mostly animal feed. You won't find alfalfa in a cereal bar, but it matters if you're choosing meat or dairy and want to know what the animals were fed.
• Hawaiian papaya. Most papaya grown in Hawaii is genetically modified to resist ringspot virus. If you see a papaya from Hawaii, it's likely one of these.
• Some squash, potatoes, and apples. A few varieties of summer squash, non-browning potatoes, and non-browning apples are genetically modified. They're less common than the row crops, but they exist.

Where these crops hide in everyday food

Corn shows up as corn syrup, cornstarch, maltodextrin, dextrose, and corn oil. Soy shows up as soybean oil, soy lecithin, and isolated soy protein. Canola shows up as canola oil or in a generic vegetable oil blend. Sugar beets show up whenever a label says "sugar" without saying "cane sugar." Cottonseed oil shows up in some processed and fried foods. If you start reading ingredient lists, the same five or six crops appear again and again.

What helps if you want to avoid them

Start with whole foods. Fruits, vegetables, dried beans, rice, eggs, and unflavored meat don't need a label to tell you what they are. A one-ingredient food leaves little room for hidden crops.

For packaged foods, choose organic versions of the high-risk crops, because USDA organic standards prohibit the use of genetically modified seed, which means organic cornmeal, organic tofu, organic canola oil, and organic sugar come from non-GMO sources. Third-party non-GMO verification labels can help on processed foods, but I treat them as one tool, not the only one.

For oils and sweeteners, read the label closely. If a package says "vegetable oil" without naming the source, the source is often soybean or canola oil. If it says "sugar" and not "cane sugar," it often comes from sugar beets. USDA rules require bioengineered disclosure on many packaged foods, but refined oils and sugars made from GMO crops do not always trigger a label. Label silence does not mean non-GMO.

How I keep it manageable

I don't aim for a perfectly non-GMO pantry. I focus on the foods my family eats every week. Cooking oil, bread or crackers, cereal, pasta, and the seasonings we use most often. Clean Monday Meals clean ingredient ramen fits that routine because the noodles are organic brown rice flour and the seasonings use recognizable ingredients, so I'm not decoding a wall of corn derivatives on a school night. That lets me save label-reading energy for the processed foods we buy less often.

If you're just starting out, pick one high-use item, such as your cooking oil or your sugar, and swap that first. Learn the ingredient names for corn and soy, because those are the two you'll see most. The rest gets easier from there.