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Diet soft drinks often contain DL-phenylalanine which makes me a bit manic (kind of fun) and a lot more active but for me no elevated heart beat. In controlled dose this can be usefull as an antidepressent but could well cause problems with prescription antidepressents.
I used to get tachy and hyperventulate when my CHF was extreme and I hadn't been stabalized by medications yet. This was caused by an enlarged heart as a result of an insect bite in the tropics when I was 14 years old.
Thatch