Hello Gwendolyn! That is a great question and somewhat difficult to answer. All of the dietary patterns heart disease reversal studies (whole food plant based no oil) were quite low in sodium. When consuming this pattern, you may get as little as 500-700 mg of sodium per day. Adding a little bit more sodium, while keeping the sodium content under 2000 mg daily theoretically should not halt the heart disease reversal process. If your blood pressure is high, then of course it would certainly be recommended to stay away from salt as much as possible. I would say that if adding a little salt to food helps you stick to a heart disease reversal plan, then do it.
Remember this however. Salt cravings subside after about 2-4 weeks on a low sodium diet. Also, try using as many spices and seasonings as you can to make things flavorful. Vinegar can also work well to give foods a flavor kick.
Hope this helps!