- Forbidden to you (for food) are: dead meat, blood, the flesh of swine, and that on which hath been invoked the name of other than Allah. that which hath been killed by strangling, or by a violent blow, or by a headlong fall, or by being gored to death; that which hath been (partly) eaten by a wild animal; unless ye are able to slaughter it (in due form); that which is sacrificed on stone (altars); (forbidden) also is the division (of meat) by raffling with arrows: that is impiety. This day have those who reject faith given up all hope of your religion: yet fear them not but fear Me. This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion. But if any is forced by hunger, with no inclination to transgression, Allah is indeed Oft-forgiving, Most Merciful. [Al-Maeda 5:3]
In many additives fatty acids are used in the production. And it is a matter of concern for many Muslims where these come from. If these are from plant origin, they are halal, if they are from animal origin they may be halal or haram, depending on the animal, or how it get slaughtered in the prescribed Islamic way.
Fats, whether from plant or animal origin, consist of glycerol and generally 3 fatty acids. Fats can be split in fatty acids and glycerol (the same reaction also takes place in the intestine when fats are digested). The fatty acids can be purified and reconnected to glycerol as mono- di- of triglycerides (glycerol with 1, 2 or 3 fatty acids respectively). Many additives consist of these semi-natural fats, which act as emulsifiers.