Give yourself a sodium test, 1/8 tsp. salt in 8 oz water. Stir and taste. Can you taste salt? If it tastes salty to you, you probably don't need sodium, UNLESS it tastes really good to you. If it tastes like plain water, or even better than plain water, you need salt.
If you cant taste other foods, then it could be aguesia, loss of the sense of taste or hypogeusia, diminished sensitivity to taste.