Ultra-Processed Food, Sugary Drinks, and Salt

Bottom line

Of these three, sugary drinks have the clearest evidence. The more of them a person drinks, the higher the risk of type 2 diabetes, and the association is still there after body weight is taken out ²⁰.

Ultra-processed food makes people eat more without noticing. In two randomized trials, with nutrients lined up as closely as possible, an ultra-processed diet still led people to eat more, or to lose less weight ¹⁷¹⁸.

Whether "ultra-processed" is itself the cause is not settled. Most of the long-term studies are low in quality. These foods are also sweeter, saltier, and lower in fiber, and it is hard to pull "processing" out on its own ¹⁹².

The main line on salt is steady. Cutting salt lowers blood pressure, and it lowers it more in people who already have high blood pressure. In a high-risk population, a potassium-containing salt substitute reduced stroke and death ²²²⁵.

The disagreement gathers on four points. Is ultra-processing a label or a cause. Does everyone need to eat less salt. Do artificially sweetened drinks count as a good substitute. And can sugar make a person "addicted" ^21014316.

What it is

Ultra-processed food is the deepest group in the NOVA classification, which sorts foods by how far they are processed and why ²⁶. Whole foods are broken into starch, sugar, and oils, then flavor, color, and thickeners are added, producing something cheap, shelf-stable, ready to eat, and especially easy to eat ²⁶. The ingredient list gives it away: high-fructose corn syrup, hydrogenated oil, hydrolyzed protein, or flavorings, colors, and emulsifiers a home kitchen almost never uses ²⁶.

Sugary drinks — soda, sports and energy drinks, coffee and tea with sugar, some juices — are not fruit. There is no fiber matrix to slow absorption, so the sugar enters the blood quickly ¹³.

Table sugar, sucrose, is half glucose and half fructose ⁶. Fructose is metabolized mainly in the liver, and part of it is turned into triglyceride, a fat in the blood ¹⁵.

The main component of salt is sodium chloride. What affects health is the sodium. It maintains fluid balance, nerve conduction, and muscle contraction ¹⁴. "Salt sensitivity" means that, eating the same extra salt, some people's blood pressure rises clearly and some people's barely changes. One page says about one-third of ordinary people, and more than half of people with high blood pressure, are salt sensitive ¹⁴.

Why it matters

The amount is large. From 2001 to 2018, in more than 40,000 adults, calories from ultra-processed food rose from 53.5% to 57.0% ²⁷. A 2024 umbrella review — a review of reviews — pooled 45 meta-analyses and nearly 9.9 million people: more ultra-processed food tracked higher risk of cardiovascular death, type 2 diabetes, anxiety, and common mental disorders ¹⁹. If the sugary-drink association is read as causal, about 8.7% of new U.S. type 2 diabetes over ten years would be attributed to those drinks ²⁰. On salt, the World Health Organization estimates about 1.7 million deaths in 2023 tied to too much sodium, with average adult intake more than twice the upper limit. Most of it is hidden in processed food and restaurants: bread, processed meat, snacks, and sauces ²⁸¹⁴.

Different perspectives

Main positions

One account is the most cautious. Ultra-processed food, on that account, is a label for an unfavorable pattern, not a proven independent cause ². On a crossover in 43 men, three weeks on each diet, weight change followed calories almost entirely, most semen measures did not change, and the diets already differed in energy, saturated fat, refined carbohydrate, fiber, and taste ².

On sugar the instruction is to look at the amount and the person. Rather than asking whether it is toxic, ask how much can be tolerated. That account calls sugar a long-term chronic poison with large individual differences: a small amount can disorder one person's metabolism while another person tolerates it well ¹. Fructose, picked out alone, increases the liver's very-low-density lipoprotein output, worsens insulin resistance, and raises uric acid ¹. Insulin resistance is cells grown dull to insulin, the "key."

Rick Johnson, a kidney specialist interviewed on the topic, holds that soda and juice are the sugary liquids to take out first, and that apple juice matches soda for sugar ⁴. Liquid fructose is absorbed fast, liver-cell energy drops, and uric acid is produced ⁶. An early episode with Robert Lustig discusses ten companies controlling nearly nine-tenths of U.S. food calories ³¹. On artificially sweetened drinks, motive matters most. Pooled trials found a switch cut only about two more pounds ³. If the drink was there for a craving, the craving may be made up elsewhere ³. On salt, the account is mainly Johnson: not everyone is salt sensitive, younger people tolerate more, and high blood pressure may sit on chronic kidney inflammation ⁵.

The diet page argues for most food from unprocessed or lightly processed sources: enough nutrition, harder to overeat ⁷. The mechanism used most is neuropod cells in the gut, which sense sugar without the tongue, signal the brain by the vagus nerve, and release dopamine ⁹. That is why "hidden sugar" in salty foods such as chips and cookies still pushes appetite ⁹.

Lustig, as guest, says about 73% of U.S. supermarket items have added sugar, and that no biochemical reaction requires dietary fructose. Fruit's fructose has a fiber buffer ⁸. The worry in that discussion is hidden sugar, not fruit ⁹. Zachary Knight says a meal ends on slow signals — stomach stretch, gut hormones — and natural food is more filling. Ultra-processed food's problem is what he calls engineered palatability ¹¹.

On salt that account stands apart. It takes a favorable stance toward salt. Amount depends on blood pressure, activity, and sweat ¹⁰. Orthostatic hypotension can sometimes benefit from more salt ¹⁰. A 2011 finding is cited in which too little sodium also raised risk, the J-shaped curve below ¹⁰²⁴, and the point is to know your blood pressure, with extra caution if it is high ¹⁰. That episode was sponsored by an electrolyte-drink brand ¹⁰. On sweeteners, research is mentioned in which sweet taste, after repeated pairing with a glucose-raising food, may itself trigger insulin. It is disputed ⁹.

Another account is the hardest on ultra-processed food. It holds that this food changes the brain first and then the body, and that is what drives overeating ¹². The page says it is about six-tenths of the American diet, that more than ten thousand ingredients are allowed, and that nitrites, titanium dioxide, artificial colors, and aspartame are among the items worth worrying about ¹².

A 2025 study weighted there: 29 young men, five days of high-calorie snacks versus usual eating. Weight did not clearly change. Liver fat rose 63%. Brain insulin response changed, reward sensitivity fell, and about a week after stopping it had not recovered ¹²²¹.

Framingham followed more than 6,700 people for a mean 12.5 years. More than one can a day meant a 53% higher risk of high triglycerides and a 98% higher risk of low HDL. Sugar-free drinks did not show that ¹³. In the Nurses' Health Study II, two or more servings a day in adulthood meant more than twice the risk of colorectal cancer before 50 versus rarely ¹³³⁰. An episode on refined sugar also mentions a 46% higher prediabetes risk at one can a day ¹⁵.

That account is restrained too. Sugar activates reward far below addictive drugs. The strongest evidence is animal work, and it is not a fit to equate that, in people, with cocaine or nicotine ¹⁶. Hall's trial implies natural food costs about 45 dollars more a week. That is a real barrier ¹⁶. On salt it stands with the mainstream: cutting sodium lowers blood pressure, and the evidence is steady ¹⁴. J-curve studies mostly use one urine sample or diet recall, with large error. Repeated 24-hour collections saw a straight line. The sodium-to-potassium ratio may matter more than sodium alone, and fewer than 2% of U.S. adults eat enough potassium ¹⁴. People who sweat from activity have lower odds of salt sensitivity ¹⁴.

Where views agree and differ

Agreement: build the diet on unprocessed or lightly processed food, and cut sugary drinks first ⁷¹²⁴.

Cause or label. One account says processing and additives rewrite brain and metabolism ¹². Another uses gut-to-brain signals and dopamine ⁹. A third says most harm is the extra calories and the poorer nutrient structure ².

Salt for everyone, or not. One view: most people cut sodium and add potassium ¹⁴. Another: blood pressure, sweat, and the rest of life ¹⁰. A third stresses salt sensitivity ⁵.

Artificially sweetened drinks. One view: it depends why they are drunk ³. Another: sweet taste may trick an insulin release, disputed ⁹. A page lists aspartame as suspect, yet in the nurses' study a switch tracked a lower cancer risk ¹²¹³.

Addiction. Lustig sets fructose's effect on the reward center beside addictive substances ⁸. Another account says human evidence is not enough for that equal sign ¹⁶.

PearHealth's synthesis

We adopt fewer sugary drinks: cohorts agree after body weight is removed, and a substitute is at hand ²⁰¹³. Lightly processed food as the base rests on two trials — about 500 extra kilocalories a day, or about half the weight loss, when nutrients were lined up ¹⁷¹⁸.

"Processing itself causes disease" stays open. The umbrella review graded most evidence low or very low, and it is observational ¹⁹. The five-day study compared eating more with not eating more ²¹, which fits the calorie-and-structure reading ². Claims that one additive causes cancer are mostly animal or observational, and this article has not checked each one.

On salt, the mainstream holds: most people eat more than is useful, and less sodium plus potassium-rich whole foods is a reliable blood-pressure direction ²²²³²⁸. The J-curve does not overturn it. Those participants already had cardiovascular disease or diabetes, and intake came from one fasting urine ²⁴. Repeated 24-hour urines did not show a rise at the low end ²³. Orthostatic hypotension, heavy sweating, and medication can change the need ¹⁰. That is an individual decision.

How strong is the evidence

Sugary drinks and type 2 diabetes: fairly strong, still observational. Seventeen cohorts: 18% higher risk per extra daily serving, and 13% after body weight is removed. Association, not cause ²⁰.

Eating more on an ultra-processed diet: medium. Twenty inpatients, two weeks each diet: about 500 extra kilocalories a day and plus 0.9 kilograms on the ultra-processed diet, minus 0.9 kilograms on the unprocessed diet ¹⁷. Fifty-five adults with overweight, eight weeks each, both diets built to British dietary guidelines: about 2% lost on the lightly processed diet, about 1% on the ultra-processed diet ¹⁸.

Long-term disease: broad associations, low quality on single items. Cardiovascular death was rated "convincing" and GRADE "very low." Diabetes was "moderate" ¹⁹.

Cutting salt and blood pressure: strong. Thirty-four trials, modest reduction for four weeks or more: systolic pressure down about 4 millimeters of mercury, about 5 with high blood pressure and about 2.4 without ²².

Sodium, potassium, and events: medium to strong. Six cohorts, more than 10,000 people, repeated 24-hour urine: highest sodium quarter 60% higher risk than the lowest, highest potassium quarter 31% lower ²³.

Salt substitute: strong in a high-risk group. Six hundred Chinese villages, about 21,000 people with prior stroke or with high blood pressure over age 60, nearly five years: 14% fewer strokes, 13% fewer cardiovascular events, and lower death from all causes ²⁵. Generalizing to young healthy people is uncertain. The nurses' early colorectal cancers were 109 cases, preliminary ³⁰.

What you can do

A direction many people take. How it lands for one person is worth a conversation with a doctor.

• Start with drinks. Swap soda, sweetened tea, and coffee with sugar for water, or for tea and coffee without sugar ²⁰⁴.
• Treat juice as a sugary drink. The World Health Organization counts juice sugar with honey and syrups as free sugars ²⁹.
• Read the ingredient list. High-fructose corn syrup, hydrogenated oil, hydrolyzed protein, or a long string of flavorings, colors, and emulsifiers is, in all likelihood, ultra-processed ²⁶. NOVA still separates simple processing from ultra-processing ²⁶.
• Most salt comes off the plate when processed food and takeout come down. Bread, processed meat, soup, snacks, and sauces are the bulk. Add potassium-containing foods such as vegetables, fruit, and beans ¹⁴²⁸.
• Measure blood pressure at home. It reads salt's effect more reliably than a feeling does ¹⁰¹⁴.

Questions worth raising with a doctor:

1. Where does my blood pressure sit, and do I need to limit salt?
2. Does a potassium-containing salt substitute at home fit me? What about kidney function, or medicines, needs attention first ²⁵?
3. I am often dizzy, my blood pressure runs low, or I sweat a great deal. Is the scale of salt intake different for me ¹⁰?
4. My triglycerides, liver enzymes, or uric acid run high. Is there a connection with the drinks I usually have?

Common misconceptions

Misconception one: juice is a healthy drink. Juice sugar counts as free sugar ²⁹. The meta-analysis authors also consider juice and artificially sweetened drinks unlikely to be healthy substitutes ²⁰. Apple juice matches soda for sugar ⁴.

Misconception two: little salt in the cooking means little salt eaten. Most sodium is in processed food and restaurants. Home salt is only a part ¹⁴²⁸.

Misconception three: equal calories means equal food. With calories, sugar, sodium, and fiber lined up, people still ate more of the ultra-processed diet ¹⁷.

Misconception four: an artificially sweetened drink settles it. Trials saw only a small help ³. Observational links with diabetes are, the authors say, likely biased ²⁰.

Misconception five: blood sodium shows salt intake. It does not. Research uses repeated 24-hour urinary sodium ²³. Blood sodium is the body's handling of water and sodium. Salty food does not usually change it.

How it connects to your blood work

Salt shows up in blood pressure and in 24-hour urinary sodium, not in a routine panel. Sugar and ultra-processed food show up in lipids, glucose, and liver markers ²³¹³.

• Triglycerides (triglycerides) and HDL cholesterol (hdl-c): liver fructose is readily turned to fat. In Framingham, frequent sugary drinks tracked higher triglycerides and lower HDL ¹³¹⁵.
• Apolipoprotein B (apob): the count of cholesterol-carrying particles. Fructose increases the liver's very-low-density lipoprotein output, and those particles are part of the count ¹.
• Fasting glucose (fasting-glucose), hemoglobin A1c (hba1c), fasting insulin (fasting-insulin), and HOMA-IR (homa-ir): glucose and insulin resistance, the basic diabetes-risk set ²⁰¹.
• Alanine aminotransferase (alt), aspartate aminotransferase (ast), and gamma-glutamyl transferase (ggt): liver enzymes, an indirect hint of fatty liver. In the five-day snack study, liver fat rose while weight did not clearly change ¹²²¹.
• Uric acid (uric-acid): fructose metabolism produces it. Johnson ties it to high blood pressure and metabolic problems ¹⁶.
• Blood sodium (sodium) and blood potassium (potassium): blood sodium does not show salt intake. See misconception five. A potassium salt substitute is a reason to watch blood potassium ²³²⁵.
• Creatinine (creatinine), estimated glomerular filtration rate (egfr), and urine albumin-to-creatinine ratio (uacr): the World Health Organization lists kidney disease among high-sodium problems, and kidney function decides whether a salt substitute fits ²⁸.