Read labels.
The human body needs 200mg of sodium per day (24 hour period) to function normally.
The USDA recommendation for sodium intake is 2,000mg per day.
Some of those microwave meals (yeah, even I'm guilty of having one once in a while) can be as much as 1040mg a serving (one package) which is over half of what you should have a day!
WHEN I go for a microwave meal, I generally try to pick out something that's at 25% or less than the USDA recommendation, that's about 500mg per serving. It's still a lot, but if I'm on the run (usually heading to the office to work) and I don't have the time to prepare a good meal for myself it will do. I don't make it a habit.
By the way, ramen noodles are great, if you know how to prepare them properly. =)
Step one: THROW OUT THE INCLUDED SEASONING PACK!!!!
I use a variety of my own seasonings, mostly Mrs. Dash or McCormick brand low/no sodium seasoning blends. I'll also use powdered low sodium beef or chicken broths with the noodles. I put the seasonings in as I'm boiling the water, before adding the noodles. I may also add a dash of seasame oil or a dash of worchestershire sauce (lower sodium counts than soy sauce and it gives a similar taste.)
If I'm REALLY going to play around, I'll add a few shrimps and toss in some cashews after I've strained the water/broth some from the noodles.
Read the package, they say to reduce the sodium levels, uses less seasonings, well almost all of the sodium in ramen noodles is in the little pouch. There's soem sodium in the noodles, but it's negligible for most people. I don't know exactly how much sodium is in the noodles alone.