Why do we need to preserve food?

Answer

Food preservation is essential because it extends the length of time during which the food is nutritionally viable and safe to eat. Most fresh fruits, vegetables and animal products spoil quickly without refrigeration, dehydration or preservation. The Clemson Cooperative Extension states that the most popular and effective preserving techniques employ salt, sugar, vinegar or brine.

According to the Clemson Cooperative Extension, food preservation works because the preserving agents prevent bacteria, mold and other potentially harmful organisms from growing on the food. Dry preserving techniques, such as packing food in salt, draws water out of the food, making it an inhospitable environment for microorganisms. Wet-preserved foods undergo heat processing that kills microorganisms, and the vacuum seal created by proper canning prevents life-sustaining oxygen from entering the container.

Most bacteria and fungal spores cannot live without oxygen and do not survive prolonged immersion in boiling water. A notable exception is the bacterium Clostridium botulinum, which causes a dangerous and potentially fatal disease called botulism. Clostridium botulinum is unusually hardy and thrives in anoxic environments; oxygen is toxic to it. It also survives boiling temperatures that kill most other bacteria. However, it cannot survive acidic environments such as pickle brine.

About.com expert Leda Meredith explains that non-acidic preserves such as unpickled vegetables, soup stock and all wet meat preserves do not contain sufficient acid to kill Clostridium botulinum. The only safe technique for making these preserves is to process the jars in a pressure canner, which subjects them to temperatures much higher than boiling water.

Q&A Related to "Why do we need to preserve food?"
You need to eat food to survivie. If you did not eat everyday you body would break down slowly and you would die. Eating good food is important as well.
http://www.ask.com/web-answers/Health/Diseases/why...
Answer Much of the food we purchase and eat contains some sort of preservative. Food needs to be preserved because it does not take very long for it to go bad. Did you know that Salt
http://wiki.answers.com/Q/You_who_preserved_foods
Chemical preservatives extend the freshness of food by inhibiting the growth of microorganisms and reducing oxidation retarding the ripening process. Preservatives cannot replace
http://www.ehow.com/facts_7427402_do-people-put-pr...
One of the reasons you need automobile insurance is that it's the law. Most states require drivers to carry automobile insurance to legally hit the road, so be prepared to keep automobile
http://www.ehow.com/info_8052067_do-need-automobil...
Explore this Topic
There are several reasons why we preserve food including to stop or to slow down food spoilage. We also preserve food to make transportation and storage of foods ...
We need food to survive because it is the main source of energy for all the body processes. Lack of food leads to lack of energy and hence alteration of the bodily ...
Humans and animals alike need food to survive because food contains several life-supporting substances that are necessary for them to survive and sustain their ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com