Recently I cut my normal coffee intake (2 very strong 16oz cups per day) to a single mild 8oz cup in the morning. Suddenly I was depressed, like meaning had be

Recently I cut my normal coffee intake (2 very strong 16oz cups per day) to a single mild 8oz cup in the morning. Suddenly I was depressed, like meaning had been swept out from under me, not to mention a 2 day headache. On the 3rd day the clouds broke and I started to feel much better, better than the best of days high as a kite on caffeine. Have more energy, less irritable, sleep better, etc. I'll be surprised if I go back to previous levels, seems incredibly unhealthy from the less is more side of the fence.