Conversation so far:
Is Red Bull bad for you?
Despite these increases, moderate and occasional intake of Red Bull is unlikely to cause serious heart problems in healthy adults.
Can Red Bull kill you?
And it can kill you. The WHO study also reports that adults who consume energy drinks may be increasing their risk of hypertension and type 2 diabetes (caffeine reduces insulin sensitivity)

Question: How much can you drink in a day
Self-contained rewrite: How much Red Bull can you drink in a day?