Good morning,
I will say a little and then Sassafras will, later, say a lot. There are two ingredients called di-sodium guanalate and di-sodium ionosonate that is found in many "vegan" dishes such as soy burgers. These ingredients are very expensive and the only thing they do is activate hidden or dormant MSG. Also, they are derived from animal by-products. If you become a Vegan, then you should consider only preparing your own foods. By the way, I spent some time in Eastern Europe in the early 90's and the majority of the residents there were vegetarians. The meat in the old USSR was so tainted that most people didn't want to eat it. The diets were wonderful and some of the best meals I ever had were in vegetarian restaurants.
Mick