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Salt has been a highly valuable commodity throughout the history of mankind — so revered that terms like “worth their salt” are used widely to describe a person’s integrity. Yet today, every newspaper, magazine, and blog seems to be telling us to avoid salt like the plague!
With all the conflicting information, it’s no wonder one of the most common questions I get asked by patients is “should I reduce my salt intake?” It’s now so ingrained in us to search for ways to reduce our salt intake, that many people don’t stop to question their efforts. Is salt really an evil additive that increases the risk of high blood pressure and cardiovascular disease, or is there more to the story?
How Much Salt Should I Consume?
Depending on which health group you talk to, everyone has a different target range for their ideal salt intake. The American Heart Association (AHA) states you should aim for less than 1,500 mg daily to prevent high blood pressure and reduce your risk of cardiovascular disease.
When you realize the average person consumes double to triple that amount (the equivalent of two to three teaspoons of salt per day), it seems logical that if we simply reduce our intake we can improve our overall health.
But where did these recommendations come from?
In the 1980s, a major worldwide study on the connection between salt intake and blood pressure was conducted, and researchers found that cultures in which sodium intake was low had lower incidences of high blood pressure and cardiovascular disease.
Animal studies confirmed that rats fed very high sodium diets rapidly developed high blood pressure and subsequently the “war on salt” began and hasn’t stopped to this day.
However, upon reviewing the latest research, it seems the question still remains unclear.
The research does show that if you already have high blood pressure, you could benefit by lowering your sodium intake. But consider the Japanese, who consume the highest amount of salt but also have the lowest incidence of CVD. Japan also has the longest life expectancy of any population on earth. Is salt really to blame for increased blood pressure and cardiovascular risk?
If we look back to our Paleolithic ancestors for answers, we estimate the average sodium intake to be approximately 800 mg, far less than today’s daily consumption of 3,300 mg. However, our hunter-gatherer ancestors also consumed a very high amount of potassium – approximately 10,000 mg per day – via their abundant intake of lean meats, healthy fats, and veggies. This ratio of sodium-to-potassium is a crucial piece of the “how much salt should I eat” puzzle, and often overlooked when doctors tell patients to restrict their sodium intake.
The Sodium:Potassium Balance
It turns out that our salt consumption has been high since the Industrial Revolution and has not changed much over the last 200 years. However, what has changed dramatically is our intake of potassium. Fewer veggies and fruits leads to lower potassium intake, thereby tilting the sodium:potassium ratio in the wrong direction–toward hypertension, cardiovascular disease, and poor health.
In 2015, a randomly controlled trial (RCT) showed that potassium supplementation helped lower blood pressure 3.9/1.6 mmHg in hypertensive patients.
Researchers are also seeing growing evidence supporting the notion that the “sodium-to-potassium ratio” is the superior metric, showing strong associations with blood pressure and cardiovascular disease (versus only addressing individual sodium or potassium levels).
As fruits and veggies are naturally very high in potassium and low in sodium, a diet emphasizing more whole foods will boost potassium levels significantly and keep sodium levels in balance.
If you are overweight and have high blood pressure, then restricting high-sodium processed foods and increasing potassium-rich veggies should be your top priority.
But what about healthy folks who are active and “eating clean”?
Advice for “Clean Eaters”
If you’re eating cleanly – minimal processed foods, snack foods, and convenience foods – and are active or very active, then the rules of the game are different. In fact, chances are you are NOT getting enough salt!
Intense exercise in the gym or training outdoors can lead to significant sweat loss, and subsequently sodium loss, so if you aren’t adding salt to your food you’ll likely be compromising your health and capacity to recover from exercise.
Salt is crucial for increasing absorption of water, preventing muscle cramping, supporting healthy nerve function, and the general health of all cells in your body.
The risks of not consuming enough salt are significant and rarely discussed.
When we look at the latest research, we find that long-term salt restriction can actually increase your risk of heart attack or stroke, elevate triglyceride levels, and in those with blood sugar issues, actually worsen your insulin sensitivity.
Based on the science, it seems we need to reframe the conversation away from “salt intake” toward “sodium-to-potassium ratio.”
Salt Intake and Overtraining
If you’re an avid Crossfitter, runner, or exerciser then chances are you are losing a lot of salt through sweat. If this persists for too long, you can develop symptoms of over-training due to low sodium status.
The problem is this is very difficult to see with traditional medical diagnostics, as the blood levels of sodium will typically remain in the normal range despite the athlete experiencing symptoms of sleep disruption, low mood, and increased thirst and urination — all common symptoms in over-trained athletes.
Both high-intensity exercise and endurance training normally mean more sweat. If you enjoy regular WODs or are training for a triathlon or marathon then salt consumption is critical to recovery and muscular health.
You should be adding salt liberally to all your meals and if you experience symptoms of over-training, add an additional electrolyte mix to help replenish sodium and electrolyte levels. If you train in warmer weather, this becomes even more important.
Table Salt vs. Sea Salts
So, what type of salt is best? Regular old table salt, sea salt, or the fancy salts from the Himalayan mountains?
While table salt has iodine added to improve thyroid health, unfortunately it’s also heavily processed, devoid of important trace minerals, and contains harmful anti-caking additives like sodium silicoaluminate.
Sea salts or Himalayan pink salts naturally contain greater concentrations of essential trace minerals and are therefore your best bet to add to your diet.
However, it’s important to consider that neither sea salts nor Himalayan salts contain any iodine, which means you should include natural sources of iodine into your diet (e.g. seaweed, kelp, etc.). Health shops typically have convenient “seaweed snack packs” and one or two seaweed chips per day is enough to get your dose.
The Paleo Diet and Salt Intake
By focusing on the “sodium-to-potassium ratio”, rather than simply “salt intake”, it reinforces the importance of eating plenty of vegetables and fruits (in moderation) in your diet.
As a general rule, the cleaner you eat, the greater amount of salt you can add to your meals. Similarly, the more active you are, the more liberal you can be with your salt consumption. And remember, too little salt is dangerous for everyone.
If you eat a diet full of convenience foods then you may be pushing the upper limit of your salt intake. Most processed and canned foods use salt as a preservative; restaurants also use salt liberally in their cooking to add flavor.
Watch this video – Is Salt Bad for ME???
Written by Dr. Marc Bubbs
Dr. Marc Bubbs, ND is a Naturopathic Doctor, Strength Coach, Author, Speaker, and Blogger practicing in Toronto, Canada. He believes that diet, exercise, and lifestyle factors have the most profound impact on your overall health and performance. Marc is the author of The Paleo Project – A 21st Guide to Looking Leaner, Getting Stronger, & Living Longer and currently serves as the Sports Nutrition Lead for Canadian Men’s Olympic Basketball Team.
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