What Should You Check Before Buying Canned Food?

When buying canned food, first check the can’s exterior. A bulging, dented, or rusty can may have experienced a pressure change or leak during storage. A sound can has a flat surface and does not cave in or flex when pressed by hand. Cans with bulging lids can pose a risk of botulism and should not be purchased; if you find one at home, discard it unopened. Do not overlook the production and best-by dates printed on the can.

What should you check on the outside of the can? Both ends should be flat. A lid or base that is slightly concave is generally normal, but an outward bulge can indicate gas inside. A deep dent in the can’s body or a crack in the seam may have let air in and could mean the contents have spoiled. Rust, especially along the seam near the lid, may indicate a leak and possible entry of microorganisms. Avoid cans with torn or missing labels because you cannot check the production and best-by information.

What information should you check on the label? Along with the best-by date, check the sodium and sugar amounts in the nutrition information; some canned vegetables and legumes can be high in salt. Products labeled “no additives” or “no added salt” may suit people who want to control the amount of salt in a recipe. For canned fish and meat, the label indicates whether the product is packed in its own juices or in oil, which can help you choose based on the recipe and your preference. A legible manufacturer name and lot number are also part of the product’s quality information.

How should you check a can after opening it? If opening it is accompanied by an unusual hiss, foaming, or a sharp odor, do not eat the contents; these may be signs of spoilage or gas formation. Check the contents’ color as well. Discard canned vegetables if you see unexpected browning or mold. Even a can that looked sound can begin to spoil more quickly after opening and exposure to air, so transfer the contents to a separate covered container and refrigerate them rather than storing them in the can. Transferring the contents after opening may also prevent a metallic taste.

Common mistakes when choosing canned food. A common mistake is buying a can on sale without checking its condition; do not choose a slightly bulging or dented can, regardless of its price. Another is stocking up on products near their best-by dates without planning to use them soon. Storing cans for a long time in a damp or warm place, such as near an oven, can also contribute to internal rust and shorten shelf life; a cool, dry cupboard is generally a better choice. These checks can make shopping for canned food safer and more economical. Avoid placing cans beneath heavy fruit and vegetables in the shopping basket, which can help prevent dents.