According to wikipedia, caffeine is used by 90% of US population, the vast majority of which is not bp. I imagine that 100% of the Brits use it if you count decaf tea because it still has some. China uses green tea which has some caffeine. Tea and coffee are major crops. If there were some widespread sensitivity to caffeine (it cannot be an allergy in the proper sense of the word because food allergies are reactions to offending proteins, think peanuts, nuts, shellfish, milk, wheat, soy, to a lesser extent beef, and caffeine is not a protein at all) that mimicked as bipolar, we'd see bp dxs in large numbers, and we do not - bp is a minority dx. But I do want to learn of an equally powerful, consistently working, socially acceptable, convenient tool to counteract the sedation and grogginess that are side effects of psych meds. I have actually asked already but received no answer.