disodium 5'-inosinate: It's a flavor enhancer that is obtained from either animal, mineral or vegetable. It's often used to flavor noodles and potato chips. That's why potato chips and noodles taste so salty. It is di-sodium salt.
Possible side effects, in my opinion: 1) fluid retention 2) high blood pressure 3) poor calcium absorption (increased calcium excretion)
If you have any medical condition and are taking drugs, it might be a good idea to consult with your doctor before consuming a high sodium diet.
I've never eaten Ramen noodles but as far as I know it's a highly processed food with little nutritional value, if any. Empty calories? I think so, unless you or someone else can tell me otherwise.