Uh, so you have wondered why does Sprite help nausea and vomiting as well. When I was a child, I was curious about it too.
If you ask most doctors, they will typically tell you to drink Sprite for an upset stomach. The explanation is that this type of clear soda helps to eliminate the gas that is in your stomach. The Sprite will actually cause you to burp which can help eliminate intestinal distress and discomfort. Clear soda like Sprite is also good because it helps replenish electrolytes that may have been lost during your illness. By introducing carbonation to an upset stomach, it helps to speed up the process of making you feel better.