According to Bustle, there is a new study out that determines how many cups of coffee impacts your personality compared to non-coffee drinkers!
That is whole of coffee huh?!
So what is the excessive daily amount? 10 cups of coffee and it has negative effects - "more likely than the general population to have a personality disorder."
The Mayo Clinic revealed it has it's benefits too - "Including protecting against Parkinson's disease, type 2 diabetes and liver disease, including liver cancer. Coffee also appears to improve cognitive function, and decrease the risk of depression." Like a cold cola, the caffeine in coffee can help get rid of headaches. After all, the biggest part of Excedrin medicine is caffeine.
Basically, it is knowing what you and your body can handle and of course drinking the best coffee product out there.