I would like to know how many geniuses didnt drink caffeine in a daily basis if any when they did their major work? Or current geniuses? Ive heard rumours that Tesla didnt drink coffee after realizing it affected his imagination, but I dont know if he continued drinking it later on. I read: http://www.ncbi.nlm.nih.gov/pubmed/17400186 which states: "long-term consumption of caffeine could inhibit hippocampus-dependent learning and memory partially through inhibition of hippocampal neurogenesis." Ive stopped drinking coffee after regular consumption for 2 weeks now, and I feel quite tired still and unmotivated with troubles to focus. thoughts?