That innocent-looking can of soda pop-no matter what it’s sweetened with-may be taking a toll on your immunity. Here’s why: 1. People who drink sodas instead of healthy beverages (think low-fat milk and pure fruit juice) are less likely to get adequate vitamin A, calcium, and magnesium. What’s more, soda contains phosphoric acid that depletes calcium and magnesium. These two nutrients help keep your immunity operating at peak efficiency. 2. Sodas containing high-fructose corn