Natural salt is generally a very healthful product. Unrefined sea salt is an important source of minerals. This is especially today, as the food supply is mineral-deficient due to hybrid crops, modern agriculture methods and food processing and refining.
Unrefined salt has little or no effect on blood pressure. It helps maintain electrolyte and osmotic balance. It also has an alkalinizing effect on the body and is an extremely yang food in Chinese medical terminology.
The sodium it contains is critical for osmotic balance and to solubilize other minerals in the blood. Deficiency of sodium causes other minerals to become biounavailable and precipitate into the soft tissues and elsewhere.
All the above are very positive reasons to eat salt on food. Avoiding a quality unrefined sea salt is rarely necessary, and often harmful since it is a source of vital minerals. I recommend quality sea salt for almost everyone. Most tolerate it well with no adverse effects, when used properly in moderate amounts only. Those with very high blood pressure may need to wait until their pressure drops, although a quality sea salt may actually assist in diminishing their blood pressure.