Many vegetarians in the world are vegetarian based on religious factors. Buddhism advocates not killing, and the Buddhist Ni Jing said, "The Buddha said: People who eat meat cut off the seeds of compassion.". In addition, in the Buddhist Shurangama Sutra, there is a saying that the five spices are onion, garlic, onion, leek and apricot koji (an Indian spice, also known as Ferula, which is not common in China).
In Buddhism, it is believed that only by removing the five spices can we be truly vegetarian. Buddhism in China can eat dairy products, but not eggs. Although wine is made of grain or fruit, it can't be eaten because it will be messy.
Disadvantages of long-term vegetarianism:
Vegetarians believe that vegetarianism is healthier, and this view is even more untenable. Compared with ordinary people, vegetarians are more likely to lack protein, calcium, iron, zinc and vitamins (especially vitamin B 12, which can only be obtained from animal foods, and lack of vitamin B 12 will lead to mental disorders). People who are vegetarians will say that all the above nutrients can be obtained from vegetarians, that is, vitamin B 12, or from certain fungi.
But first of all, protein, calcium, iron and other nutrients can also be obtained from plants, but the absorption rate of such nutrients obtained from plants is much lower than that obtained from animal foods, which means that it is more difficult for vegetarians to obtain these nutrients.
Secondly, compared with ordinary people, vegetarians must pay great attention to the types and collocation of food in order to get more comprehensive nutrition, but many people can't do this, so vegetarians are more likely to lack nutrition than ordinary people.
Baidu encyclopedia-vegetarianism