Yes, but you know the "with fries and make it large, but diet coke, I am trying to lose weight tee hee hee" stereotype, right? :) Usually diet coke is drunk by people who are fighting their unhealthy habits, as it seems people who always had healthy ones are more content with water.
The fact that the stereotype exists doesn't mean that the strategy works. It only shows that the marketing works.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.