i've been eating a bowl of some TASTY/healthy cereal recently that has some B-12 in each serving...i have kind of an off-topic Q about B-12 but...if each cup of this cereal has 40g of carbs...and B-12 speeds up metabolism like i think someone said...what does taking in this cereal do to my body?...lol...because if all the carbs are supposedly going to be converted to fat if i don't use them quickly...but simultaneously B-12 speeds up my metabolism...then i guess i break even at the end of the day, right?