1) Drinking coffee regularly can negatively impact sleep patterns and health in several ways such as inhibiting nutrient absorption, increasing dehydration, and reducing blood flow to the brain. 2) Withdrawal symptoms from caffeine can occur after only two weeks of regular consumption of one to two cups per day in the form of excessive tiredness. 3) Chronic coffee consumption is associated with various health risks including bladder, kidney, and heart problems that can take years to manifest.