Salt, Healthy? Why It Might No Longer Be Public Enemy No. 1

For decades, we've been told to eat less salt for lower blood pressure—but could this advice be harming, rather than helping, our health?

Salt, Healthy? Why It Might No Longer Be Public Enemy No. 1Photograph by Christian Mertes via Wikimedia Commons
The Problem with Too Little Salt

The idea that eating less salt can worsen health outcomes may sound bizarre, but it’s not new. A 1972 paper published in the New England Journal of Medicine reported that the less salt people ate, the higher their levels of renin, a substance secreted by the kidneys, which set off a physiological cascade of events that seemed to end with an increased risk of heart disease. In this scenario: Eat less salt, secrete more renin, get heart disease, and then die prematurely.

Content continues below ad

Four years ago, Italian researchers began publishing the results from a series of clinical trials, all of which reported that, among patients with heart failure, reducing salt consumption increased the risk of dying prematurely. Other recent studies suggest that reducing sodium to anything like what government policy refers to as a “safe upper limit” (one teaspoon a day if you’re healthy) is likely to do more harm than good. These studies, which covered some 100,000 people in more than 30 countries, showed that salt consumption is remarkably consistent—about one and a half teaspoons a day—among populations over time. This suggests that how much salt we eat is determined by physiological demands, not diet choices. And a handful of these studies—involving type 1 diabetics, type 2 diabetics, healthy Europeans, and patients with chronic heart failure—reported that the people eating salt at the lower limit of normal were more likely to have heart disease than those eating smack in the middle of the normal range. Effectively what the 1972 paper on the salt-renin connection would have predicted.

Proponents of the eat-less-salt campaign tend to deal with this contradictory evidence by implying that anyone raising it is a shill for the food industry (which has been widely criticized for adding salt to processed foods to improve taste) and doesn’t care about saving lives. An NIH administrator told me back in 1998 that to publicly question the science on salt was to play into the hands of the food industry.

When several agencies, including the Department of Agriculture and the Food and Drug Administration, held a hearing last November to discuss how to go about getting Americans to eat less salt (as opposed to whether or not we should eat less salt), these anti-salt proponents argued that the latest reports suggesting damage from lower-salt diets should simply be ignored. According to cardiologist Graham MacGregor, MD, who has been promoting low-salt diets since the 1980s, the studies were no more than “a minor irritation that causes us a bit of aggravation.”

This attitude that studies that go against prevailing beliefs should be ignored on the basis that, well, they go against prevailing beliefs, has been the norm for the anti-salt campaign for decades. Maybe now the prevailing beliefs should be changed.

Next: Who’s right? The other side of the salt shaker.

Want to stay smart and healthy?

Get our weekly Health Reads newsletter

how we use your e-mail
We will use your email address to send you this newsletter. For more information please read our privacy policy.

Funny Jokes

Some people like to travel by train because 
it combines the slowness of a car with the cramped public exposure of 
an airplane.

Dennis Miller

Funny Jokes

I think my pilot was a little inexperienced. We were sitting on the runway, and he said, “OK, folks, we’re gonna be taking off in a just few—whoa! Here we go.”

Kevin Nealon

Funny Jokes

“I can’t wait until your vacation is over.” 
—Everyone following you on Instagram


Funny Jokes

A man knocked on my door and asked for a donation toward the local swimming pool. So I gave him a glass of water.

Comedian Greg Davies

Funny Jokes

Just found the worst page in the entire dictionary. What I saw was disgraceful, disgusting, dishonest, and disingenuous.


Funny Jokes

Client: We need you to log in to the YouTube and make all our company videos viral.


Funny Jokes

My cat just walked up to the paper shredder and said, “Teach me 
everything you know.”


Funny Jokes

“Just because you can’t dance doesn’t mean you shouldn’t dance.” 

@yoyoha (Josh Hara)

Funny Jokes

My parents didn’t want to move to Florida, but they turned 60 and that’s the law.

—Jerry Seinfeld

Funny Jokes

Q: What do you call an Amish guy with his hand in a horse’s mouth?

A: A mechanic.