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The vegetarian diet involves abstaining from eating meat, fish and poultry. People often adopt a vegetarian diet for religious or personal reasons, as well as ethical issues, such as animal rights. Others decide to become vegetarian for environmental reasons, as livestock production increases greenhouse gas emissions, contributes to climate change and requires large amounts of water, energy and natural resources . There are several forms of vegetarianism, each of which differs in their restrictions. The most common types include:
