I think it would depend on the ratio of jam to peanut butter and bread. High sugar concentrations are an excellent way of preventing bacterial growth as it acts as a desiccant which is why jam can last so long without spoiling. So, unless there’s enough moisture in the peanut butter and bread, your discarded gut bacteria will die out. It turns out that too much of a good thing really can be bad for you.
I think it would depend on the ratio of jam to peanut butter and bread. High sugar concentrations are an excellent way of preventing bacterial growth as it acts as a desiccant which is why jam can last so long without spoiling. So, unless there’s enough moisture in the peanut butter and bread, your discarded gut bacteria will die out. It turns out that too much of a good thing really can be bad for you.