The Salt Wars: What the Science Actually Shows — and Why the Caribbean Kitchen Was Not the Villain It Was Made Into

The central argument

For half a century, public health institutions have been telling that grandmother she was killing her grandchildren.

The American Heart Association recommends no more than 1.5 grams of sodium a day for people of African origin. The World Health Organization caps the whole world at 2 grams. The Pan American Health Organization, in a February 2025 report on Caribbean populations, declared that the region’s salt intake is roughly double what is safe — and called for mandatory sodium reduction in foods, front-of-package warning labels, and tighter marketing rules. The headline numbers are everywhere. The verdict is settled. The Caribbean eats too much salt, and the Caribbean is paying for it in heart attacks and strokes.

It is a tidy story. It is also, when you actually read the science, a story that has not survived contact with the largest cardiovascular study ever conducted.

What follows is an investigation into the salt wars — what the trials actually show, where the guideline numbers came from, who funded which side of the argument, and what the Caribbean’s particular diet problem really is. The conclusion may surprise you. It is not “eat all the salt you want.” It is something more interesting, and considerably more useful to anyone trying to feed a Caribbean family well.

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The verdict you were given

The dominant narrative on sodium is fifty years old, and it goes in a straight line. Sodium raises blood pressure. High blood pressure causes heart attacks and strokes. Therefore , reducing sodium will reduce heart attacks and strokes. The WHO, AHA, CDC, and PAHO have built decades of public-health messaging on that chain of reasoning.

The trouble is that the chain has a weak link in the middle. The claim that the effects of salt on cardiovascular disease are exclusively mediated through its effects on blood pressure has never been proven. And when researchers have looked carefully at the upper-limit recommendations — the 2-gram and 1.5-gram cutoffs that anchor every guideline — they have found, repeatedly, that the supporting studies do not actually demonstrate health benefits below those thresholds.

In 2013, a U.S. expert committee convened by the Institute of Medicine reported that there was no health-outcome-based rationale for reducing sodium intake below 2,300 milligrams per day. The committee did not endorse the AHA’s more aggressive 1,500 mg target. It did not, in fact, set an upper limit at all for the healthy general population. That finding — from a federal expert body, in a federally commissioned review — should have changed the conversation. It did not.

The number line that changes everything

To understand why, it helps to look at the actual numbers on the actual ruler.

Where Caribbean salt intake actually sits — the same number tells two stories depending on whose ruler you use The most rigorous Caribbean measurement we have is a 2018 study from the George Alleyne Chronic Disease Research Centre at the University of the West Indies, which collected 24-hour urinary excretion data from 364 Afro-Caribbean adults in Barbados. The average sodium excretion was 2,656 milligrams per day . Sixty-eight percent of participants exceeded the WHO’s 2-gram cap. Because urinary excretion typically captures around 80–90% of intake, the true average Caribbean intake suggested by that data is roughly 3.4 grams of sodium per day — give or take. That is the number you should hold in your head.

Now lay out the rulers:

• The American Heart Association , the most aggressive, says people of African origin should consume no more than 1.5 g/day .

• The World Health Organization says everybody should be under 2.0 g/day — a target that, as the WHO itself concedes, no country on Earth has ever achieved at the population level.

• The PURE Study — the Prospective Urban Rural Epidemiology study, the largest investigation of sodium and cardiovascular outcomes ever conducted, with 130,000+ participants across 49 countries — found that the lowest cardiovascular risk is associated with intake between 3 and 5 g/day . Risks rise above 5 g, mostly in populations (largely in China) that average more than 12 g of salt daily.

Plot the Caribbean’s actual 3.4 g/day intake on that number line and a strange thing happens. It is well above the AHA and WHO recommendations. PAHO is technically correct that Caribbean intake is roughly double the WHO cap. But it is also sitting almost exactly in the middle of the range that the world’s largest cardiovascular study identifies as optimal .

The same number tells two completely different stories depending on whose ruler you choose to use. And the question of which ruler to use is, in the end, the entire question.

PURE: the elephant in the kitchen

The PURE Study is hard to dismiss, and that is part of why it has been treated, in some quarters, the way one treats a piece of furniture that does not fit through the door: by pretending it is not there.

PURE is run by the Population Health Research Institute at McMaster University in Hamilton, Canada, with collaborators on every populated continent. Its sodium results have been published in The Lancet and the New England Journal of Medicine . The most consequential paper, led by Dr. Andrew Mente and published in The Lancet in 2018, examined community-level sodium intake across 21 countries — 95,767 people in 369 communities for the blood-pressure analysis, and 82,544 people in 255 communities for the cardiovascular outcomes analysis.

What did it find? Three things, all of which run hard against the dominant narrative.

First , higher sodium intake was associated with lower rates of myocardial infarction and total mortality in most of the world. The association with stroke risk only appeared in communities consuming above roughly 5 g/day of sodium — a level reached, in the PURE data, only in China. In every other region, including those eating well above WHO targets, there was no detectable harm from higher sodium intake and a measurable benefit from moving toward, rather than away from, the 3–5 g range.

Second , the relationship between sodium and health appears to be a J-curve. Risk is elevated at the very high end of intake. Risk is also elevated at the very low end. In the middle — at roughly 3–5 g/day — the risk floor is reached. This is, as Mente has put it, the pattern you would expect for any essential nutrient.

“At moderate intake, sodium may have a beneficial role in cardiovascular health, but a potentially more harmful role when intake is very high or very low.”

— Dr. Andrew Mente, lead author of the PURE sodium analyses, McMaster University

Third — and most underreported — the same studies that found no clear harm from moderate sodium found a consistent and powerful protective effect from potassium . Communities with higher potassium intake had lower rates of every major cardiovascular outcome, independent of how much sodium they were eating.

The criticisms of PURE are real and worth taking seriously. The 2018 community-level analysis used spot urine samples rather than full 24-hour collections, and a handful of papers in the Journal of Hypertension and elsewhere have argued that the formulas used to estimate intake from spot samples can produce a spurious J-curve. The reverse-causation problem — that sicker people may eat less salt because they are already restricted by their doctors — is genuine. None of this is a knockout punch against PURE; the study has its own rebuttals on each point, and the consistency of the J-curve across multiple analyses using different methods is hard to attribute to a single sampling artifact. But intellectually honest reading of the salt literature requires acknowledging that the methodological debate is unresolved.

What it does not require is pretending the largest study in the field does not exist.

The biology nobody told you about

Beneath the headline numbers is a piece of physiology that the simple “salt is bad” narrative leaves out entirely.

Sodium is an essential nutrient. It maintains plasma volume, regulates acid-base balance, conducts nerve impulses, and powers normal cell function. When sodium intake drops below the body’s needs, it activates a hormonal cascade called the renin-angiotensin-aldosterone system (RAAS) — the body’s emergency response for conserving salt. RAAS activation is not a benign event. Sustained activation has been associated with increases in plasma lipids, insulin resistance, and, in several large studies, increased mortality from cardiovascular causes.

A low-salt diet, in other words, has a metabolic cost. That cost may be acceptable in someone with severe established hypertension, in whom every modest blood-pressure reduction is worth purchasing. It is a different calculation entirely in someone whose blood pressure is normal, who is being told to drive their sodium below 1.5 grams for “prevention” of a disease they do not have.

This is what the J-curve actually means, in lived physiological terms. There is no free reduction. The graph does not slope down forever. Push the average healthy person’s intake too low, and the body fights back — and the fight has consequences.

The wrong villain

The wrong villain — and the real one. Traditional Caribbean cooking paired salt with potassium-rich foods. The modern problem is what replaced both halves of that equation If the guideline numbers are too aggressive, why is the Caribbean still suffering from the highest hypertension rates in the Americas — Dominica at 50%, Jamaica and Haiti both around 48%, Barbados at 41%? The cardiovascular catastrophe is real, the numbers are not disputable, and PAHO’s concern — even when its prescription is questionable — is not made up.

The answer, when you actually look at what is on Caribbean plates, is that the diet has been changing in a direction the salt-focused guidelines almost entirely miss.

In Barbados, 40.5% of daily caloric intake now comes from ultra-processed foods. That is the figure to circle. We are no longer talking about saltfish and breadfruit. We are talking about packaged snacks, sodas, instant noodles, bouillon cubes, imported processed meats, sauces, and the modern industrial seasoning blends that have quietly replaced the herbs and aromatics in many Caribbean kitchens. In Trinidad and Tobago, an analysis of 1,239 processed and ultra-processed products found that the great majority of them — sauces, dressings, packaged fish and seafood products — exceeded the sodium thresholds set by the PAHO Nutrient Profile Model.

This is the real story buried under the salt-shaker debate. The Caribbean is not eating more salt because grandmothers have grown reckless. It is eating more salt because industrial foods carry far more sodium than home-cooked ones , and industrial foods have steadily replaced home cooking. The shaker on the table is not the problem. The shaker that arrived already mixed into the package is.

And there is a second piece to the puzzle that almost never reaches the public.

The forgotten partner

Sodium and potassium are biological opposites. They function as a pair. Potassium helps relax blood vessels, signals the kidneys to excrete excess sodium, and is, by every available measure, a stronger predictor of blood-pressure outcomes than sodium alone. The single most useful number in nutritional epidemiology is not the absolute level of sodium in the diet. It is the sodium-to-potassium ratio .

This is where the story gets interesting for the Caribbean — and where the traditional kitchen turns out to have been quietly, almost accidentally, brilliant.

A plate of stewed saltfish served alongside callaloo, breadfruit, plantain, and a piece of avocado pear is a high-sodium meal. It is also a catastrophically high-potassium meal . Callaloo, sweet potato, breadfruit, plantain, dasheen, yam, avocado, beans, coconut — the staples of the traditional Caribbean plate — are among the most potassium-dense foods on the planet. The grandmother’s saltfish was not floating in a void. It was floating in an ocean of potassium that was doing exactly what potassium is supposed to do.

When researchers look at the PURE data, the consistent finding is that the combination of moderate sodium and high potassium is associated with the lowest cardiovascular risk anywhere measured. Communities eating in that combination — found, historically, in many traditional food cultures, including the Caribbean — out-survive both the low-sodium-low-potassium populations of the modern processed-food West and the high-sodium-low-potassium populations of the Chinese provinces where the salt-stroke link first emerged.

What happened to the Caribbean, in epidemiological terms, is not that traditional eating got worse. It is that traditional eating got replaced. The saltfish is still on some tables. The breadfruit and callaloo have been quietly giving way to white rice and bouillon cubes; the sweet potato to fries; the fresh sea fish to canned tuna; the cooked greens to bagged snacks. The sodium side of the ratio is being maintained (and arguably amplified) by the ultra-processed shift. The potassium side has collapsed.

The “salt problem” is, in significant part, a potassium problem with a misleading name.

The colonial reading

There is a question that has not, in fifty years of public-health conversation about Caribbean diets, been asked nearly often enough. Who wrote these guidelines, and in what populations were they developed?

The AHA’s 1,500 mg-per-day recommendation specifically for people of African origin is grounded in research on a phenomenon called salt sensitivity , which is genuinely more prevalent in Black populations than in white ones. Salt-sensitive individuals do see meaningful blood-pressure responses to changes in sodium intake. That is real. But the policy leap — from “salt-sensitive individuals respond to sodium” to “every adult of African origin should eat less than 1.5 g/day” — is a population-level prescription that has not been validated by population-level outcome trials. It was a precautionary translation of laboratory physiology, applied at scale to a racial category, by an institution whose research was conducted overwhelmingly in North America, not in the Caribbean.

The Caribbean was, in this sense, prescribed for. It was not asked. The studies that produced the guideline numbers were not done on Caribbean populations eating Caribbean diets. The cultural assumptions baked into “reduce salt, eat less of those traditional dishes, move toward a modern healthful pattern” carried, embedded inside them, an implicit verdict on Caribbean foodways themselves — a verdict pronounced by institutions that had never sat down to a plate of stewed saltfish with breadfruit and callaloo.

This is not the same argument as saying the guidelines are racist or malicious. They are not. The argument is structural. The world’s nutritional guidelines were calibrated to North American and European processed-food diets, in populations whose health outcomes were studied with North American and European endpoints, and then exported as universal. They have, in many cases, been imposed on traditional food cultures whose actual problems — and whose actual protections — they fail to describe.

A serious Caribbean nutrition policy would not start with “how do we get the population below 2 g of sodium.” It would start with “how do we get the population off ultra-processed food and back on potassium-rich traditional staples.” Those are not the same question. The first one is what we have been asked for fifty years. The second is what the data, honestly read, actually demands.

What actually works in a Caribbean kitchen

The honest synthesis of the science is unglamorous, and that may be why it does not produce headlines. None of what follows is medical advice for any particular person; people with established hypertension, kidney disease, or heart failure should follow the specific dietary plan their own clinician has worked out with them. What follows is what the population-level evidence supports for the broader, mostly healthy Caribbean adult population.

Reduce ultra-processed food. This is the single most defensible change anyone can make. Bouillon cubes, packet seasonings, sodas, packaged snacks, instant noodles, and processed meats are the actual sodium delivery system in the modern Caribbean diet — and they bring almost no potassium, fibre, or micronutrients with them.

Increase potassium-rich traditional foods. Callaloo, breadfruit, sweet potato, plantain, dasheen, yam, avocado, beans, coconut, citrus. The traditional Caribbean plate, eaten in something approximating its traditional form, brings sodium and potassium into a ratio the heart actually likes.

Do not panic about the home-cooked salt. If you are cooking a stew, seasoning a piece of fish, or adding salt to a pot of rice, the amount you are adding by hand is, in almost every realistic Caribbean kitchen, a small fraction of what is hiding in the packaged products you are buying. The shaker on the table is the wrong battlefield.

Move. Sleep. Manage stress and weight. Blood pressure responds to all of these in larger ways than it responds to small sodium changes. The Caribbean’s hypertension crisis has more than one cause, and the lifestyle factors are bigger levers than the salt shaker is.

Have your numbers measured. None of the above is an argument for ignoring blood pressure. Get it checked. If it is high, treat it. The argument is that the population-level prescription — eat as little salt as possible — has not been earned by the evidence, and that the energy spent fighting the home cook would be better spent fighting the ultra-processed food shelf.

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The Caribbean Issues take

The most consequential thing about the salt debate is what it has trained Caribbean people to feel about their own food.

For fifty years the message has been, in essence: your grandmother was wrong, your traditional dishes are killing you, modernize, comply, reduce. That message has produced a generation of Caribbean adults who feel quietly guilty about a plate of callaloo and saltfish — and who have, in the same decades, drifted toward the ultra-processed food shelf because at least the back of the package gives them a number to count.

The science does not support that bargain. The grandmother’s plate was, on a sodium-to-potassium-to-fibre basis, closer to optimal than the modern processed substitute. The institutional warnings about traditional Caribbean eating were calibrated to populations and foods that bear almost no resemblance to ours. The real catastrophe — the ultra-processed shift, the potassium gap, the loss of breadfruit and dasheen from daily tables — has been happening in plain sight, mostly uncovered by the guidelines that were supposed to protect us.

This is what food sovereignty looks like, in its most ordinary form. It is the right of a Caribbean people to read the science honestly, to defend the parts of our traditional diet that the evidence supports, and to refuse the imported prescriptions that do not. It is the right to keep the pinch of salt that has always been there — and to spend our political energy on the ultra-processed shelf that has, quietly, taken over.

The grandmother was, mostly, right. The kitchen she built was, mostly, healthier than the one we are being sold as its replacement. The data has been telling us this, slowly and through teeth, for at least a decade. It is past time we listened.

A note on individual health. This article reports on population-level science and public-health policy. It is not medical advice. If you have established high blood pressure, heart disease, kidney disease, heart failure, or any condition for which a clinician has prescribed specific dietary sodium targets, follow your clinician’s individualised guidance. The argument here is that the population-wide guidelines have been overstated, not that anyone with an established medical condition should ignore the plan their doctor has worked out with them.