Do you ever grab a Coke when you're nauseous?
Some people who suffer from nausea say that a glass of Coke helps against nausea. Others claim that minerals and sugars in Coke help against traveler's diarrhea/dehydration.
There is no scientific evidence that Cola can be recommended for gastrointestinal complaints or dehydration. Diet Coke can even give you diarrhea. Are you nauseous? You could try a sip of Coke, but there is no guarantee.
Sometimes there can be a placebo effect. If you believe Cola helps… Then maybe it helps.