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Slaughter should be in accordance with the way recommended by Islam, it is obligatory, if not, it is not permitted to eat that animal. Scholars unanimously agree on this.
It is permissible to eat anything to which no ruling of prohibition applies. Yet, it is discouraged to eat uncooked onions, garlic and similar plants right before going to the mosque.
The basic rule about forbidden food is that whatever is unclean, unwholesome or harmful must not be eaten. All substance and alcohol are also forbidden such as poison and narcotics.
Any food that is clean and harmless is permissible in Islam, whether vegetarian or not. The Quran and the Sunnah states clearly what is forbidden to eat due to being harmful.
Islamically, all food is lawful to eat except what God has made forbidden. God forbids only what is of no benefit to man, or what may have a bad effect on man’s health or what is sinful.