
For preserving the taste of food, it is important that you cook it properly. Thorough heating is required to get rod of harmful pathogens such as E. coli and salmonella.
The U.S Department of Agriculture advises cooking ground meat to an internal temperature of a minimum of 160°F and all kinds of poultry to at least 165°F. If you wish to check it yourself, ground meat turns brown or grey from inside when done; poultry is cooked well when its juices are clear. A completely cooked fish can flake with a fork.
A meat thermometer is the best way to confirm that it is cooked alright.
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