Bottom line: We salt our food because it tastes good, not because we need the extra sodium. Sodium is an essential element of salt, but not all sodium-rich foods taste salty. You wouldn't add salt to your breakfast cereal, for example, yet many are high-sodium foods (low-sodium foods contain 140 mg or less of sodium per serving). Sometimes you can't tell until you read the nutritional information. One serving (1 cup) of General Mills' Corn Chex cereal contains 240 mg of sodium. Similarly, one serving (1 cup) of Kellogg's Corn Flakes contains 200 mg of sodium.