Earlier quoted context omitted.
I suspect this is to try to quantitatively match the stimulant effect of caffiene plus sugar/HFCS in the sweetened alternatives.
Am I the only one that experiences sugar as a depressant? Eating high glycemic index foods makes me lethargic and sleepy. I've never experienced a "sugar high". I also don't have diabetes as my blood sugar level is within norm during routine physicals.
https://www.mayoclinic.org/diseases-conditions/diabetes/expe...
It could occur even if fasting blood glucose is still at normal levels.