In Australia, the Australian Government Analytical Laboratories (AGAL) has undertaken major nutritional studies on canned food, using methods specified by the Australia New Zealand Food Authority. Its findings? There are no practical differences between the nutritional value of fresh and canned foods.
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Q: I was raised on canned foods, and I often find myself feeding them to my family. Are there any that are as good for you as fresh produce?
A: Contrary to popular opinion, canned foods can be a very nutritious choice. According to research from the University of Massachusetts that compared the nutritional values of canned, frozen and fresh vegetables, canned products definitely hold their own. The study's authors found that the same recipe made with fresh, frozen or canned ingredients delivers an almost identical nutrition profile in each case.
Canned foods can actually be better than the "real" thing because of the lag time between fresh produce being harvested and displayed in supermarkets. The food is usually hauled long-distance and stored in centralized warehouses first, so store-bought produce often loses some of its just-picked nutritional value. The canning process takes produce at its nutritional peak and freezes it at that point. Sometimes canning even adds nutritional value to a food. Take tomatoes: The process of cooking them helps release the lycopene (a disease-fighting phytochemical that occurs naturally in red plants) embedded in their cell walls. Because canned tomatoes are cooked at high temperatures and are promptly sealed, processed tomato products beat out fresh tomatoes as the best sources of lycopene.
Of course, another benefit of canned foods is practicality. They tend to be considerably cheaper than fresh, and they keep indefinitely, allowing you to buy in bulk and maintain a pantry stocked with vegetables, fruits, beans and fish. Having cans on hand makes it less likely that you'll depend on fast food when you need to prepare dinner in a pinch!
There are some potential drawbacks to canned foods. For starters, they tend to have a very high sodium content ?- as much as 60 times more than the raw product! Sodium has traditionally been used to preserve foods and enhance their flavor, but today many foods can be packed effectively without it. Whenever possible, opt for low-sodium or "no added salt" canned goods. Other pitfalls come in the form of sugars and fat. Fruits packed in heavy, high-calorie corn syrup are more decadent than diet-friendly, so stick to fruits packed in their own juice. And keep an eye out for fat content, especially in canned foods such as chili, stew and oil-packed tuna. Check nutrition labels before you buy, and look for foods with no more than 3 grams of fat per serving.
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