Salt intake is linked to a number of medical disorders. I'm not an MD, but I encourage you to do the research for yourself -- heart disease especially is often linked to a high-sodium diet.
In the short run, yes, you'll retain water and lose weight more slowly. The % daily salt was recently lowered to 1500mg, so it's even LOWER than you think now! Struggling with salt is a daily thing for a lot of us here - I try to eat fresh greens/veggies whenever I can and not out of a can, but some days, you just have to.
Just be conscious of it and do your best, and do some research as well
Female, 31 years old, 5'4 1/2" tall
Starting weight 1/4/11 = 215.2 lbs.
Weight 9/19/14 = 176.6 (net: -38.6)
Last mini-goal: 180 lbs. REACHED! Reward - new sports bra
Current min-goal: 175 lbs.
Next large goal: 165 lbs. by 12/25/2014
Lowest weight: 156.7 lbs.
150.2 lbs. <--- Official "Healthy BMI" weight
Estimated final goal: 130-140 lbs.
"You don't have to change your life today. You only need to change your day today."