Alcohol with Diet Soft Drinks Accelerate Intoxication
http://www.counselheal.com/articles/3747/20130206/alcohol-diet-soft-drinks-accelerate-intoxication.htm
When I first read the title I was skeptical, but the reasoning is very plausible to me. The sugar in regular soda triggers the body to begin the digestion process which slows down the absorption of the alcohol (and who knows, might actually detoxify a small amount; your body has enzymes to detox alcohol as it is naturally produced in your muscle cells during anaerobic activity).
So, the take home message is: have your mixed drinks with regular soda. A 20% increase in your level of intoxication is plenty to trigger alcohol’s well-known effect of trashing your ability to think clearly.
I guess, though, that if you are trying to get drunk and prefer doing so with mixed drinks, you could accelerate your journey to la la land by using diet soda as your mixer.
