Shrimp
Packaged, plain, frozen shrimp commonly contains added salt for flavor, as well as sodium-rich preservatives. For example, sodium tripolyphosphate is commonly added to help minimize moisture loss during thawing. A 3-ounce (85-gram) serving of non-breaded frozen shrimp may contain as much as 800 mg of sodium, 35% of the RDI. Breaded, fried shrimp is similarly salty.
In contrast, a 3-ounce (85-gram) serving of fresh-caught shrimp without salt and additives has just 101 mg of sodium, or 4% of the RDI. Opt for fresh-caught if you can or check a health food store for frozen shrimp without additives.