Nobody is COMPELLED to be a vegetarian, so the question of whether they are allowed to eat something is a bit off; they would be allowed to stop being vegetarians, if they so desire. The question that you mean to ask, I believe, is whether chicken flavor is considered to violate the principles of vegetarianism. And that would depend upon how the chicken flavor is made. Chicken flavor may contain an extract taken from actual chickens, in which case it violates vegetarianism. However, if you can simulate the flavor of a chicken without using any animal source, that does not violate vegetarianism. It's not the flavor that vegetarians object to, it is the killing of animals.
Yes, absolutely! In fact, many vegetarians probably prefer organic foods.
they are vegetarians
They ate fish and chicken and figs. Many Romans were vegetarians, so they ate many of the things they grew on their land, however the non-vegetarians ate alot of beef and chicken, they also used to eat alot of eggs as nearly all Romans owned chickens.
egg
Meat.
There is tofu
Hindus are vegetarians.
fish chicken beef cheese vegetables
Meat doesn't have fiber in it. Vegetarians eat foods high in fiber.
food is flavored by seasoning, natural recordes around where it grew, and other foods added to another food
Chicken...
Glucose is in all foods so yes.