Saturday, October 12, 2013

Is fresh food better than canned food? What would u say??

Is fresh food better than canned food? What would u say??
How interesting . . ..
What is canned foods . . 
Canning is a way of processing food to extend its shelf life. The idea is to make food available and edible long after the processing time. 
Canning is a method of preserving food in which the food contents are processed and sealed in an airtight container. Canning provides a typical shelf life ranging from one to five years, although under specific circumstances a freeze-dried canned product, such as canned, dried lentils, can last as long as 30 years in an edible state.
To prevent the food from being spoiled before and during containment, a number of methods are used like pasteurisation, boiling (and other applications of high temperature over a period of time), refrigeration, freezing, drying, vacuum treatment, antimicrobial agents that are natural to the recipe of the foods being preserved, a sufficient dose of ionizing radiation, submersion in a strong saline solution, acid, base, osmotically extreme (for example very sugary) or other microbially-challenging environments. Other than sterilization, no method is perfectly dependable as a preservative.
How canning began . .
Throughout human history, food preservation has been essential to survival. Fresh or raw food is perishable and becomes unfit to eat over a relatively short time. So throughout history, people have tried to come up with a way to keep perishable foods fresh. Until the early 19th century, the only options were pickling, salting, drying or smoking these provisions. Although these methods preserved food, they affected its taste, texture and nutritional value.
A 1997 study by the University of Illinois Department of Food Science and Human Nutrition found that canned fruits and vegetables provide as much dietary fiber and vitamins as the same corresponding fresh foods, and in some cases, even more.
Fresh foods begin losing vitamins as soon as they are picked, and often sit in warehouses or in transit. Fresh fruits and some vegetables are harvested before they are even ripe.
Canned foods high in vitamin A and related carotenes, such as carrots, sweet potatoes, and pumpkin, protect the the body's cells and improve night vision. Canned tomatoes have high levels of lycopene, which studies show to help prevent prostate cancer.
Contrary to popular belief, canned fruits and vegetables use no chemical preservatives, but are preserved via natural heat methods.

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