Given the fact that salt has played an integral role in shaping human evolution, history and culture, it's astounding that modern-day health authorities have taken such a negative stance on salt consumption.Despite a plethora of studies to the contrary, the conclusion is that a diet low in sodium is key to preventing life-threatening illnesses such as high blood pressure, congestive heart failure, heart attacks and strokes. It's a wonder that our ancient ancestors made it out of Mesopotamia alive.
Take a walk through the aisles of your local supermarket and you'll no doubt be overwhelmed by the vast array of prepackaged, processed foods that are labeled "low sodium", which gives the consumer the impression that these products are healthier choices.
But does the scientific evidence support the claims that a low-salt diet is good for our health, or is this just another case of junk science, mixed with bad politics and served with a side of special interests?
First, let's start at the beginning.
A History of Salt
As hunter gatherers, humans obtained their sodium primarily from the blood and organ meats of wild game. Sodium chloride has proven to be essential for brain development in growing fetuses and infants and this has led some scientists to speculate that the consumption of higher sodium levels played a significant role in the evolution of human intellect.
Around 10,000 years ago most humans began the transition from a nomadic cultural existence, to agricultural societies based on farming. At this time, the harvesting of salt became an integral part of these cultures - in fact, it was considered a gift from the gods.
It was used primarily as a means to preserve meat, fish and dairy products for storage and transportation. If you were to outline the rise of many ancient empires on a map, you would see that these cultures specifically chose to inhabit areas in close proximity to large salt deposits. Salt was so valuable to ancient Romans that their soldiers were paid partly in salt and to this day we use the word " salary" for wages, which is derived from the Latin word Salarium, meaning salt.
Dangers of a Low-Salt Diet
To be fair, a low-sodium diet has been shown to lower blood pressure in a small segment of the population who tend to be salt sensitive. However, this slight drop in blood pressure in these individuals had little effect on their overall cardiovascular health.
Interestingly, a 2010 study published in The Journal of the American Medical Association reported that even a modest reduction of salt intake can lead to an increased risk of heart disease and death. Other studies have implicated low salt intake with increased insulin resistance, which can set the stage for type II diabetes.
The new USDA dietary guidelines for salt intake has been reduced to as low as 1500 mg per day for some populations, which is less than the minimum bodily requirement for the average adult to maintain optimum health.
Since salt is so vital for proper physiological function, your body will perceive a shortfall as an emergency situation and activate what's called the Renin-Angiotensin-Aldosterone system via your kidneys and adrenal glands. This enzymatic hormonal cascade helps your body to reabsorb what little sodium is left back into your system to avoid a condition called hyponatremia. If blood levels of sodium fall too low, it can cause a dangerous drop in blood pressure, as well as swelling of the brain that could possibly be fatal.
Because water always follow salt, chronic activation of the Renin-Angiotensin-Aldosterone system can lead to edema, high blood pressure, kidney disease, heart failure, insulin resistance and brain degeneration - all due to your body's response to the stress of low salt intake.
If all that isn't bad enough, a low-salt diet can also make you fat! This is due to the fact that low sodium levels in your blood causes a reduction in metabolic rate and increases the stress hormone cortisol, which is catabolic to lean muscle tissue and triggers your body to store more fat, particularly in the abdominal region.
The Health Benefits of Salt
Salt is an essential nutrient, meaning your body can't live without it. Unfortunately, now that salt is being demonized by mainstream health authorities, the population at large is not being told of the multitude of positive health benefits of appropriate salt intake, such as the following:
- It alleviates asthma and allergies because of its anti-inflammatory antihistamine actions in the body.
- It is vital for energy production, protein transport and enzyme function, as well as the absorption of nutrients from the small intestine into the body's cells.
- It is necessary for the production of hydrochloric acid in the stomach which helps to digest protein, kill pathogenic organisms that may be ingested with food or water, and for extracting nutrients such as minerals and vitamin B12.
- It is needed for the proper production of bile in the liver (stored in the gallbladder) which aids emulsification and digestion of fats.
- Sodium is an essential electrolyte and along with appropriate water levels, is needed for proper functioning of the body's entire nervous system.
As you can see, much like other nutrients before it (think carbohydrates and fats) nutrition researchers have thrown the baby out with the bathwater when it comes to dietary salt.
The Salt You Need
If you happen to be one of the millions of North Americans who eat a steady diet of fast food, chances are that you're getting more than your fair share of salt. Unfortunately, it's the wrong kind of salt.
Our ancient ancestors had it right by harvesting and consuming unrefined sea salt which contains important minerals needed for health such as magnesium, calcium, potassium and of course sodium.
In contrast, regular table salt has been stripped of these essential minerals and processed to include chemical additives such as aluminum silicate (used as an anti-caking agent), which can be toxic to the nervous system.
Another marketing ploy is the newer colored sea salts (such as Himalayan salt) which are being touted as having mystical healing properties. These should be avoided, because the color in these salts is due to a high inorganic iron content, which will create a toxic pro-oxidative state in your body. This is of particular concern for men because they do not menstruate and excess iron levels can lead to heart disease and cancer.
Summary
So your best (and safest) bet is to follow the wisdom of our ancient ancestors and use unrefined sea salt to taste, when preparing and cooking foods and continue to savor the flavor of this essential nutrient!


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History
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