Islamic law prohibits a Muslim from consuming alcohol, eating or drinking blood and its by-products, and eating the meat of any animal which itself eats meat, such as pork, monkey, dog or cat. For the meat of an animal to be halal it must be properly slaughtered by a Muslim or a Person of Book (Christian or Jew), while mentioning the name of Allah; for instance the animal may not be killed by being boiled or electrocuted and the carcass should be hung upside down long enough to be bloodfree. By some Fatwas, however, the animal has to be killed only by a Muslim. However, some other Fatwas rule that, according to the Quranic verse 5:5 that declares the food of the People of Book is halal, the slaughter may be done by a Jew or a Christian. Thus, some observant Muslims will accept kosher meat.
Some of these traditional dietary restrictions may have been created to prevent trichinosis, which can be caught from undercooked pork, and other similar diseases.