I guess you're trolling?
First, bread isn't a "living organism". By no stretch of the imagination is bread alive.
Second, vegans don't eat anything at all that comes from or is produced by an animal. A "vegan" is NOT defined as a person who eats no "living organisms". If that was the case then they could eat meat because meat is not alive, in the same way that most fruit and vegetables that you buy in the shop are not alive.
Third, everything that anyone eats was, at one time, alive but it's rare that anyone intenionally eats something that is still alive. I guess that a person who picks and eats a few berries or picks and eats some beans or peas could be said to be eating something that's alive but it could equally be argued that, as soon as they are picked, they cease to be "living".
Basically, a silly question.