Heavenly Father wants us to take care of the bodies we are given for our mortal lives. It is a test of our worthiness how well we do. When the Prophet Joseph Smith received the revelation we call the Word of Wisdom a lot of meats were preserved using salt, since there was no effective refrigeration other than the cold of the Kirtland winter. Sawdust around ice blocks could only extend the season so much. It makes sense that Heavenly Father wanted us to eat less meats and more grains, fruits, and vegetables. See Doctrine and Covenants 89:12-13, 16.
Although there is no specific warning about salt, it makes sense of in the context of less meat and more vegetables and grains. Look at our modern diet and see how salt is a problem. Scientists tend to recommend that adults eat no more than 1,500-2,000 milligrams of sodium per day, and in the case of people with high blood pressure doctors often recommend sticking to 1,500.
A look at the Denny’s nutritional guide is instructive of the problem of modern restaurants and the need for more home cooking:
Item: Sodium Content:
T-Bone Steak 2,900 mg
Bourbon Chicken Skillet 3,040 mg
Vegetable Beef Soup (bowl) 1,549 mg
Chili (bowl) 2,020 mg
Be careful at all restuarants or even better cook mostly at home and take care of your bodies. In the name of Jesus Christ, Amen.