Nutrition: Salt

Too much salt in one's diet is a bad thing. Therefore too little salt in one's diet is a good thing. Wrong.

Disclaimer

Consuming too much salt can cause organ damage and death. This article in no way suggests that eating excessive amounts of salt is a healthy practice.

Commonly Accepted Belief

Consider:

There's obviously something wrong with this logic. Yet that's the same logic used to suggest that salt is unhealthy:

Similarly it's the same false logic often used to suggest that low-salt diets are healthy:

The Truth

There is a limit to how much pressure the blood system can safely handle. Too much pressure can cause aneurysms or rupture of the aorta, leading to stroke or death. Anyone with hypertension should avoid anything that raises their already high blood pressure as it could push it past their personal limit. For instance, they shouldn't run up stairs, they shouldn't get angry, and they shouldn't eat more salt than they need.

On the other hand, if they can do anything to reduce their normally high blood pressure, they should do so, as it gives them a greater margin for survival when they unavoidably do something that temporarily raises their blood pressure. For instance, walking slowly, remaining calm, and maintaining slightly low levels of sodium by limiting the amount of salt they consume.

For hypertensive people, the benefits of a low-salt diet can sometimes outweigh the risks.

But for non-hypertensive people, a low-salt diet offers risks, but no benefits.

Risks

Low sodium blood levels, known as hyponatremia, can interfere with one's brain processes, causing seizures, comas, and death.

Assuming their physicians have even bothered to tell them about it, hypertensive people willingly risk these effects in order to reduce their risk of stroke or heart attack. But there are times when the risk simply isn't worth it. In periods of excessively hot weather, the people most likely to suffer are those on low-salt diets. All they need to do is add some salt to their glasses of water, but knowing that salt is bad for them, they don't, the low-sodium levels make them confused, they become dehydrated, and they die.

Meanwhile, the vast majority of people do not have chronically high blood pressure. For them, a low-salt diet is unjustifiably dangerous, whatever the weather.

Above minimum and occationally slightly high amounts of dietary salt can be quite beneficial and healthy.