Corn can be considered both a vegetable and a grain. When the kernels are still on the cob, they're technically a vegetable. However, the kernels themselves, once separated from the cob, are a whole grain. For those on a low-carb diet, corn is typically thought of as a carb because one cup of corn has 41 grams of carbs.  If you're including corn in your meal, you can order it quickly and easily through Instacart for same-day delivery in as little as 2 hours!