Shaking up the Conventional Wisdom on Salt | Competitive Enterprise Institute | Michelle Minton • January 24, 2017 – What Science Really Says about Sodium and Hypertension
This situation parallels the current restrictions on opioids, only with less drastic results.
Somehow, the someone got the idea that all Americans should restrict their sodium intake to some arbitrary level to reduce the rate of hypertension in the population.
This turns out to be nonsense.
The notion that if you eat too much salt you will have high blood pressure has been perceived as medical gospel that most people—including this author—believed for the past three decades.
But in recent years, research has emerged that challenges this once accepted truth.
Around the world, chronically elevated blood pressure affects approximately 40 percent of the adult population. In the United States, nearly one in three adults qualifies as hypertensive, which puts individuals at greater risk for many serious health events, including heart attack, heart failure, and stroke.
A public health strategy that successfully reduces hypertension rates has the potential to improve millions of lives and save millions of dollars.
A misguided approach, on the other hand, would at best fail to reduce hypertension; at worst it would encourage behavioral changes that increase harm, obscure more effective means of risk reduction, and erode public trust in agencies.
For these reasons, population-wide recommendations should be rare and adhere to rigorous standards.
Based on a review of the scientific literature, the results of nearly four decades of government efforts focused on sodium restriction, and the existence of other—possible more effective—means of hypertension reduction as presented in this paper, the current government recommendations on sodium fail to meet this standard.
Key findings of this study include the following:
- Humans require a certain amount of dietary sodium in order for our bodies to regulate fluid homeostasis.
Too little sodium will result in the body ceasing to function, while too much can cause strain and death. However, the scientific community has yet to agree on an optimal range of sodium intake.
- At least in part, the factors that determine what amount of salt a person craves (“salt appetite”) may be determined biologically and influence a person’s eating behavior in unconscious ways, making it resistant to public policy efforts to lower sodium intake (which may prompt undesirable physiological responses and changes in behavior).
- Currently, government health agencies such as the U.S. Department of Health and Human Services, U.S. Department of Agriculture, and Centers for Disease Control and Prevention recommend adults consume less than 2,300 milligrams of sodium per day.
This limit originated not from a process of scientific consultation, but from government fiat, prompted by politicians, bureaucrats, and industry.
This is exactly what has happened with opioids, whose dosages are being restricted by the very same forces: politicians, bureaucrats, and industry.
- Most human populations consume a relatively similar level of sodium that is much higher than the U.S. government recommendation, while only a handful of populations—some isolated tribal and Sub-Saharan peoples—consume less than 2,300 milligrams a day.
- Americans have not significantly increased sodium intake since such investigations began in the 1950s. This is despite increases in processed food consumption, more sodium in processed food, and significant increases in both calorie consumption and average weight.
- Lowering sodium can lower blood pressure for some people, but the response may only be seen at a certain extreme consumption level and is heterogeneous.
When sodium is decreased,
- some individuals will experience decreases in blood pressure,
- some will experience no change, and
- some will see their blood pressure increase.
- Scientific evidence is inconsistent regarding the health benefits of moderate sodium restriction for individuals who are not hypertensive.
- People do not die as a result of high blood pressure, but rather from health effects linked to, but not necessarily caused by elevated blood pressure.
As a corollary, blood pressure reduction does not always result in improved health outcomes.
- Diets consisting of sodium levels lower than the recommended level are associated with negative health outcomes, though the cause of this association is unclear.
- There is almost universal agreement within the scientific literature that other dietary factors, such as weight loss and increasing potassium intake,
Such alternative strategies also appear to
- be beneficial for a larger portion of the population,
- have a greater probability of adherence, and
- have less chance of unintended consequences.
Worldwide, government attempts to lower population sodium intake below the recommended limit have failed despite four decades of effort.
This is also a parallel to the drug war, where decades of government policies and policing have failed over and over again at reducing addiction in America.
Considering this failure and what we currently know—and do not know—about the biological effect of sodium restriction on the population at large, government health agencies engaged in efforts to lower hypertension rates should abandon their myopic and ultimately futile war on salt.
This is a good way to described the current opioid restrictions: myopic and ultimately futile.
The development of high blood pressure is
- not influenced by a single genetic or lifestyle factor;
- sodium reduction may be advisable for some,
- but ineffective or counterproductive for others.
Again, the parallel with opioid restrictions is uncanny:
- Biased and vague data is collected to support the desired position
- Then standardized rules are made on the basis of manipulated statistics
This is what happens when statistics are misused and misunderstood, usually deliberately to some predetermined end.
Population statistics are not applicable to individuals.
The most effective approach for risk reduction can only be made on an individual basis by patients and their health care providers.
And this is absolutely true of opioids for pain reduction as well.