High blood pressure is critical to control since it can hasten kidney disease. Many people know to reduce sodium intake to about 1500 to 2,000 mg a day. 140 mg per serving is considered low sodium. AND.....sodium is found in it's highest levels in prepared and processed foods including canned items like soup and olives, pickles, cheeses, etc. Be careful because it adds up quickly. On the other hand, if you follow the DASH diet (dietary approaches to stop hypertension) you will find that while reducing sodium in your diet you can ADD potassium, calcium and magnesium foods. Potassium is found in tomatoes, avocadoes, cantelope, honeydew, bananas, potatoes, etc. Magnesium is found in whole grains and greens, and nuts. Calcium is found in dairy products like LOW sodium/low fat cheese, low fat milk or yogurt and seaweed like hiziki!
It's important to think about what you can do instead of only what you CAN'T do!