Yes, they do. The amount will be on the label. Almost ALL canned foods contain salt. I just looked at canned black-eyed peas in my pantry. 1/2 cup contains 480 mg, or 20% of MDR. I use canned beans sometimes, but ALWAYS rinse them to get rid of a lot of salt.
You should try to keep sodium to 1300-1500 mg a day, if not less. I recommend that you look at the DASH diet. There are good resources for it on-line.
I was looking at this just the other day and found out this:
sodium free- less than 5 mg
very low- 35 mg or less
low- 140 mg or less
reduced-amount reduced by 25%
unsalted-no salt added
I hope that helps.
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