Fresh, Frozen, or Canned: How to Compare the Right Nutrition Numbers

Choose a source that matches the food

Use USDA FoodData Central for loose produce and other generic foods. Search for the food, then match fresh or raw, frozen, canned, cooked, drained, sweetened, or unsweetened as closely as the entry allows. Foundation Foods provide analytical data for basic foods, while SR Legacy is a historical data type and FNDDS represents foods reported in federal dietary surveys.

Use the FDA-regulated Nutrition Facts label for the exact bag, box, or can you bought. It gives the product's serving size, calories, sodium, and Added Sugars when required. Convert the label serving to the amount you actually use rather than assuming the whole package equals one serving.

Open Food Facts is a collaborative database of packaged products. Its information is contributed voluntarily by users, and its own API documentation says accuracy, completeness, and reliability are not assured. A barcode result is useful for finding a likely record and speeding up entry.

Compare an Open Food Facts result with the physical package, especially after a reformulation or design change. If the community record and current label disagree, use the current label. The package in hand is the final check for that specific product.

Weigh the edible portion

FoodData Central Foundation Foods documentation reports values on a 100-gram basis for the edible portion. Refuse such as an apple core, peach pit, chicken bone, or inedible skin is excluded. Weighing a whole item and applying an edible-only value to the whole weight overstates the amount eaten.

For a fresh peach, remove the pit and weigh the flesh that enters the bowl. For frozen peach slices, use the food itself and follow the entry or label state. Surface ice and a lump of freezer frost should not be counted as peach.

FoodData Central portion weights are specific to the food and data type. A cup value can describe a particular cut or packing method. Grams give a cleaner comparison when fresh slices, frozen pieces, and canned halves settle differently in a measuring cup.

To use a value stated per 100 grams, multiply that value by the edible grams and divide by 100. Keep the database row attached to the measurement so a raw weight is not later paired with a cooked or drained entry.

Read drained weight and packing liquid carefully

A can's net weight usually includes water or another packing medium. FDA's Food Labeling Guide notes that a drained weight may also be given when the liquid is normally discarded. Net weight and drained weight answer different questions.

Federal nutrition-label rules generally base declarations on food as packaged or purchased. For foods packed in water, brine, or oil whose liquid is not customarily consumed, the declaration is based on the drained solids. The reference-amount rule uses the same drained-solids principle, with an exception when both solids and liquid are customarily consumed.

Check the serving description for words such as drained, about one-half cup, or pieces. If you drain canned beans and the label describes drained beans, weigh the drained beans. If the label covers the food with its liquid and you add that liquid to soup, include the amount used under that label basis.

Canned fruit in water, juice, or syrup needs the same close reading. Draining syrup changes what reaches the recipe, yet the exact change cannot be recovered by guessing how much sugar remained on the fruit. Use a label or FoodData Central entry that matches the packed and drained state as closely as possible, and record whether the liquid went into the dish.

Compare sodium and Added Sugars at equal amounts

Plain frozen vegetables can have a short ingredient list, while a seasoned frozen side can contain sauce and salt. Canned vegetables can be no-salt-added, regular, or seasoned. Read sodium in milligrams for the same edible gram amount before deciding that the storage form explains the difference.

The FDA Daily Value for sodium is 2,300 milligrams on a 2,000-calorie label. The percentage can help with a quick comparison, though the milligram value is easier to scale into a recipe. Two servings provide twice the labeled sodium.

For fruit, read Total Sugars and Added Sugars. FDA defines Added Sugars as sugars added during processing, including sugars from syrups and concentrated fruit or vegetable juices. Naturally occurring sugars in fruit are included in Total Sugars and are not counted as Added Sugars.

Unsweetened and no added sugars do not mean calorie-free. Compare calories, serving grams, and Added Sugars on the same basis. A sweetened frozen fruit package and an unsweetened frozen fruit package are two different products even when both contain the same named fruit.

Match prepared and as-sold values

Nutrition declarations are generally based on the food as packaged or purchased. Some products also show information for the food as prepared. Read the column heading and preparation instructions before copying a number.

A frozen vegetable with butter sauce is already a combined product. A plain frozen vegetable that you cook with one tablespoon of butter needs the vegetable and butter entered separately unless a prepared column clearly includes that addition.

Dry soup mix, frozen concentrate, and pasta can change weight when water is added or removed. Water changes serving weight without adding calories. Milk, oil, sugar, and other additions change both weight and the recipe total. Use the label instructions only when you followed those amounts.

For a fair kitchen comparison, choose the same edible amount and the state you will serve. Record fresh peach flesh, thawed unsweetened peach slices, or drained canned peaches in the source that matches each one. Then compare calories, sodium, and Added Sugars without mixing package weight, drained weight, or prepared weight.

Questions

Sources

• USDA FoodData Central, Data Documentation
• USDA FoodData Central, Foundation Foods Documentation
• FDA, How to Understand and Use the Nutrition Facts Label
• FDA, Food Labeling Guide
• eCFR, 21 CFR 101.9, Nutrition Labeling of Food
• eCFR, 21 CFR 101.12, Reference Amounts Customarily Consumed
• Open Food Facts, API Introduction