princess,

"Actually, that is a common misconception about Veganism. " The research studies have shown otherwise. I rarely make comments or statements that are not based on peer reviewed publications and research. There are vegan ways to get the rest of the essential amino acids but the sources can be problematic.

I can not say for sure due to memory issues but I think the research I read was trying to support your statement but found the opposite.

There are multiple research studies that show a smaller brain mass in those with vegan diets. This holds true across all age ranges and other variables. They even considered lacto vegetarian and such and so the animal based diets were notably better for the needs of the brain. The nutritional value from a few whole eggs a week can make a big difference.