Rafael can stop consuming blood for days, nothing will happen to him but if he doesn't consume blood in a week he will weaken, his fur will turn gray very white almost white.
if rafael eats, drinks something other than blood he weakens, and his fur turns almost white.
although it is not instantaneous, it is progressive
There are 2 ways to return to normal, one is to sleep for a few days or the second is to take large amounts of blood.
Rafael only needs one liter per day but to return to normality he needs double