Wednesday 28 September 2011

doctor referral study "When food goes bad"



To dr refer study food goes bad. Toss or not to toss: Exactly when leftovers become trash has fueled arguments of couples, roommates and co-workers since the dawn of the refrigeration.Does moldy bread go in the trash, or just get a trim around the green spot? Can Sunday's leftovers be Friday's meal? What about that day-old ground beef?
Bread
Ever wonder why that wonderful fresh loaf you bought at the bakery grows mold in a matter of days, while the grocery store variety can last for several weeks? The difference is preservatives, which can greatly extend the shelf life of mass-produced bread. But you also play a role in how long bread survives in your kitchen.
In order to lengthen the shelf-life of bread it should be stored in a reasonably air-tight container,recommends Ira Allen, a spokesperson for the Food and Drug Administration (FDA). Humidity will also create a prime environment for bread to mold, so try to store bread in a dry place if possible.
Cheese
When it comes to its edible lifespan, not all cheese is created equal. Hard cheeses can literally last for years, while soft cheeses (like brie or goat cheese) will mold much sooner,says Allen. That’s because of the difference in the amount of moisture in the cheese—ones with more moisture grow mold much faster than those with very little moisture content. Soft cheeses should be tossed when you see mold starting to grow, but hard cheeses can be salvaged. Allen recommends slicing away at least one inch around all sides of the moldy area to make the remaining cheese safe to eat.
Milk
There are two good guidelines to follow when trying to decide if the milk in your fridge is spoiled. Check the date on the carton and give it a sniff. If it smells sour to your nose, chances are it won’t taste very good in your coffee or cereal. There’s no difference in the lifespan between organic and non-organic versions of milk, but the amount of fat in the milk can impact its shelf life. Over time, the milk fat will become rancid, and since non-fat or skim milk has had all of the fat removed, it can last longer than whole milk, says Allen.



Eggs
Keeping eggs safe means keeping them cool. Make sure you purchase them from a refrigerated case and store them at home in their carton in the refrigerator. You can use the  best if used by date stamped on the carton as your safe-eating guide, but as a general rule eggs should last for about three weeks after you bring them home.
Cold cuts
If you buy your lunch meats freshly sliced from the deli counter, you want to make sure you eat them within three to five days. An unopened package of turkey, ham, bologna, salami or other deli meats can be stored for up to two weeks. But once you break that factory seal, they still need to find their way onto a sandwich within three to five days.
Mayonnaise
Since mayonnaise contains eggs, it’s not made to last forever. But when it’s commercially manufactured, the condiment also contains ingredients to help preserve it and extend its shelf  life.



Your jar will probably have a best by date stamped on it. Whether the jar is opened or remains sealed, it will taste best if you use it by that date. “Once the jar is opened and the product exposed to oxygen, the flavors in the oil may be affected,” says Allen. Again, the best approach is to follow your nose. If the oils separate and start to smell off, the mayonnaise is past its prime.

Mayonnaise
Since mayonnaise contains eggs, it’s not made to last forever. But when it’s commercially manufactured, the condiment also contains ingredients to help preserve it and extend its shelf  life.

Your jar will probably have a best by date stamped on it. Whether the jar is opened or remains sealed, it will taste best if you use it by that date. Once the jar is opened and the product exposed to oxygen, the flavors in the oil may be affected, says Allen. Again, the best approach is to follow your nose. If the oils separate and start to smell off, the mayonnaise is past its prime.



Fresh meat and poultry
As a general rule, you should plan to use or freeze fresh meats within days of purchasing them. The United States Department of Agriculture  recommends cooking and eating poultry one to two days after purchasing, and cooking and eating other meats beef, pork, veal within three to five days. The good news is that meat keeps much longer in the freezer. If you don’t think you’ll have a chance to cook what you’ve bought, toss it in the freezer and know that you can safely defrost and cook it any time over the next year.

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