(2013) At the time (76 points, 82 comments) https://news.ycombinator.com/item?id=5008593

Part 2 (231 points, 124 comments) https://news.ycombinator.com/item?id=5017486

The author went old turkey. That is rough. For me going cold turkey caused massive headaches. I cut out caffeine a decade ago. It was a haphazard affair. I wanted to improve my sleep, so I started limiting my intake by stopping in the afternoon. At the same time I started having anxiety and panic attacks in the morning before my first dose. It was so bad I lost 10 pounds. That’s when I started to figure out “hey this might be a problem”. Over the course of a month I reduced my caffeine intake to zero. No headaches. Panic attacks went away. Ymmv.