Around our parts 7up is consider medicinal if you've the flu as it's the right balance of sugar and salt in it. Hot toddy to prevent a cold. I'm not sure of any studies.
7up has 132 mg of sodium and 112 g of sugar per liter. Oral Rehydration Solution has 1000mg of sodium and 14g of sugar per liter. Gatorade is much closer with 440 mg of sodium and 58g of sugar per liter.