How do vegetarians keep healthy?

Nutrients in animal products are equally important to mood. Vegetarians often don't eat enough, which is also harmful to mental health and can't be compensated by plant-based diet. So vegetarians, or people who often don't eat meat, should pay attention to those nutrients? Vitamin B 12 Let's just say that if you want to attend a party attended by various nutrients, vitamin B 12 is the one that everyone is vying to be friends. It is very powerful, influential and important. Anyway, no one wants to stand on its opposite side. Most people know vitamin B 12, probably because it plays a powerful role in preventing cognitive degenerative diseases such as Alzheimer's disease. Mental confusion and memory loss are the two most important signs of vitamin B 12 deficiency, which in turn shows its importance to brain health. Therefore, anxiety and depression may also be accompanied by vitamin B 12 deficiency, because vitamin B 12 deficiency may inhibit the secretion of brain chemicals serotonin (a neurotransmitter related to the pleasure center of the brain) and dopamine (an emotional regulator that can record memories and emotions). Vegetarians are particularly prone to vitamin B 12 deficiency, because this nutrient comes almost entirely from animal foods, such as beef, seafood, eggs and dairy products. According to the statistics of American Vegetarian Association, 47% of semi-vegetarians (who don't eat meat, only eat egg milk) and 92% of vegans suffer from vitamin B 12 without vitamin B 12 supplementation.