A British study counted the IQ of 8170 people at the age of 10 and their diet in adulthood. The results show that the higher the IQ at the age of 10, the more likely it is to become a vegetarian at the age of 30. Another survey of the diets of tens of thousands of people with high IQs shows that most of these people are vegetarians. 
vegetarianism is the choice of smart people, vegetarianism makes you and me wiser, which has become the slogan of many vegetarian restaurants.
The development of the brain is inseparable from adequate phospholipids, and the main source of phospholipid diet is fish and eggs.