Guys, obviously coffee consumed orally isn't the sole cause of hair loss.
However, it can be one of the many many factors that can contribute to accelerated hair loss provided one already has Androgenetic Alopecia when consumed, especially in excess, however that is dependent on the individuals body as everyone's body is different (some have greater tolerances and some less).
However, obviously if you're suffering with hairloss, the less factors you have that contribute to hairloss, the better for your hair.