Fatty Liver Expert: Your Liver Is Filling With Fat Right Now - Dr David Unwin

Why does it matter? Because a bowl of cornflakes hits your blood harder than a chocolate bar — and your doctor may have been paid not to tell you.

Dr. David Unwin spent 25 years following guidelines, prescribing drugs, and watching his patients' health deteriorate. Then a patient marched in and told him off. Her blood sugar was completely normal — and she hadn't touched her metformin. She'd learned online what her doctor never taught her: that bread, rice, and cornflakes are all sugar. He was partly paid to prescribe the drug she'd stopped needing. Every word she said was true.

• A plain bowl of cornflakes delivers the equivalent of 8 teaspoons of sugar to your blood. The chocolate bar delivers 7½. A baked potato, 9. Boiled white rice, 10.
• Pre-diabetes is 93% reversible on a low-carb diet — but wait five years and that drops to 50%.
• One in three people in the developed world has a fatty liver silently undermining their insulin function, and most have no idea.
• Your doctor may have been financially incentivized to prescribe drugs rather than tell you that rice spikes your blood more than candy.

A plain bowl of cornflakes delivers more sugar to your blood than a chocolate bar — and the baked potato beats them both

Starchy carbs are "glucose molecules holding hands," as Unwin puts it. Digestion breaks those bonds, and free sugar floods your blood — whether or not the food tasted sweet. This is the mechanism behind one of the most disorienting demonstrations in recent memory.

On the studio table: cornflakes (no frosting), a baked potato, 150g of boiled rice, a ripe banana, and a chocolate bar. Steven guessed one sugar cube each for the cornflakes, potato, and rice, three for the chocolate. The real figures, from Unwin's teaspoon-of-sugar equivalent system: cornflakes 8, banana 6, chocolate bar 7½, potato 9, rice 10.

"The error you made with the corn flakes is there's no sugar there but it's all carbohydrate and it's a very sugary carbohydrate."

The practical fix is simple and mostly ignored: stop scanning the added sugar row on labels and start reading total carbohydrates. Every 4 grams is roughly one teaspoon of sugar entering your blood. Orange juice, smoothies, dried fruit — same trap. Once you squeeze or dehydrate fruit, the fiber disappears and the sugar hit arrives fast. A standard bottle of barbecue sauce contains around 30 sugar cubes. White chocolate is approximately 70% white sugar. The labels will not tell you this plainly, and the word "fruit" functions as a halo that suspends critical reading entirely.

Pre-diabetes is 93% reversible right now — but every year of delay costs roughly 20 percentage points off those odds

Ninety-three percent. That's the share of pre-diabetics in Unwin's practice north of Liverpool who achieve completely normal blood sugar on a low-carb diet, and the result holds for years. "93% resolution and that will last for years because I've checked."

By the time full type 2 diabetes arrives, that number falls to 73%. Wait five more years: 50%. "The chances of me not needing drugs and be able to do a good job for you are diminishing. So really it's a stitch in time."

What makes this urgent is how invisible the process is. The fatty liver that drives insulin resistance runs silently for roughly a decade before any symptom appears. Meanwhile, "maybe a third of all the people in the world with type 2 diabetes don't even know they have it because they haven't taken a test." In 1986, when Unwin started practice, there wasn't a single type 2 case in anyone under 55. He's now seeing it in patients under 25.

The cost of delay is specific: every year of poorly controlled type 2 diabetes strips 100 days from life expectancy. A third of a year, compounding. A fasting insulin or HbA1c test tells you where you sit on that timeline. The gap between 93% and 50% reversibility is approximately the time it takes to decide you'll deal with it later.

One in three people in the developed world has a liver filling with fat — and the damage runs for a decade before any symptom appears

Unwin brought two actual human livers to the studio. One was healthy, pink, compact. The other was enlarged and visibly yellow — saturated with fat. The difference is stark. What isn't visible is the decade during which the fatty one looked unremarkable from the outside.

"You've got fatty liver for about 10 years. You don't even know. You wouldn't know that your liver's gone fatty and yellow like that." This is the long silent scream from the liver, named by Unwin's friend Professor Roy Taylor at Newcastle. Fat accumulates in the liver. Insulin resistance develops. The pancreas compensates by producing more insulin. Eventually, the pancreas itself becomes fat-infiltrated and can no longer keep up. At that point, blood sugar becomes unregulated.

One in three people in the developed world is somewhere in this sequence. Belly fat is the external signal — and Unwin's screening tool requires only a piece of string: your waist should be less than half your height. Fat on the belly is metabolically more dangerous than fat on the arms or legs because it reflects what's happening inside the liver and around the organs.

"Fatty liver interferes with the good work of insulin... you develop a thing called insulin resistance, which means your insulin is no longer as powerful as it was." The architecture fails slowly, invisibly, then all at once.

Unwin was literally paid based on how many patients were on metformin — and it took a furious patient to teach him what bread was

In 2012, a woman Unwin had treated for over a decade marched into his office. She had news: she was going to tell him off.

Her blood sugar was completely normal. She had stopped taking her metformin. She'd been learning — from an online community of 40,000 people — what her doctor never taught her. "I had to learn online that bread is sugar, that rice is sugar, that breakfast cereals are sugar, and when I cut those foods, I don't need your metformin now." Then she called it schoolboy biology, the kind he should have known at sixteen.

Every word was true. Part of Unwin's pay was structured around the percentage of his patients on metformin. "So is it fair to say that you were somewhat incentivized to give people metformin? Yes, that would be true."

For 25 years he followed guidelines, watched health deteriorate, and blamed the patients when the advice didn't work. "I never joined the dots. The failure was not theirs. It was mine... I was blaming patients for their failure to lose weight and it was my failure because I didn't give them advice that worked." He had been advising patients to eat two tablespoons of All-Bran daily with skimmed milk. When that failed, he blamed their compliance. The failure was structural. It was his.

Your bloodstream holds exactly one teaspoon of sugar — which is why a single banana can double a diabetic's blood glucose within the hour

Take all the blood from Unwin's body — five liters — and ask how much sugar is dissolved in it when his glucose is normal. The answer is one sugar cube. One.

"Glucose is number one vital, but number two toxic if you have too much of it. The level of it in my blood is controlled minutely." This is why the system is so precarious for anyone with damaged insulin response. A banana — carrying roughly six teaspoons of glucose equivalent — enters a system calibrated for one. "If I eat a banana, it doubles my blood sugar because I can't regulate my blood sugar."

And the damage from a spike isn't slow. The glycocalyx — the non-stick lining of blood vessels — is measurably damaged within six hours of high blood glucose exposure. Not over years. Hours.

A continuous glucose monitor, available for $20–30 on Amazon, makes this visible in real time on a phone. Steven wore one and discovered that ketchup — which he hadn't been tracking — produced a significant spike. Once you watch your blood respond to a bowl of rice or a glass of orange juice, the relationship between food and biology stops being abstract. "Once you've seen it on your phone, you can't unsee it." Unwin considers the CGM the most powerful tool currently available for breaking through decades of mislabeled food.

About 14% of people have a genuine ultra-processed food addiction — and policing a loved one's eating drives it underground and makes everything worse

The patient was a successful businessman. Wealthy, intelligent, with type 2 diabetes so severe his blood sugar blocked the knee surgery he desperately needed. His wife started putting detergent on the bread in the bin to stop him eating it at 4am. He ate it anyway. She switched to bleach. He kept going.

"He's getting up at 4 in the morning, rummaging through the bin to eat the bread with the detergent on."

This is what addiction looks like, Unwin says — not stupidity, not laziness, but a compulsion that operates below conscious decision-making. Unwin's own wife Jen, a clinical health psychologist, spent decades cycling through weight gain and loss before recognizing herself in the same pattern. "About 14% of the population has some aspects of ultra-processed food addiction." When Unwin asks patients about specific foods, they often break down. "I've never told anybody in my entire life about — and bread is a common one — I can't control how I eat bread."

The instinct to intervene — monitor the eating, question the choices, hide the food — backfires reliably. "If you police somebody you love, the result is deceit." Steven confirmed this from his own life: being monitored by a partner drove him to hide wrappers. The deceit compounds shame, and shame compounds the addiction.

Recovery for Unwin's patient required all three: low-carb diet, continuous glucose monitor for real-time feedback, and a low-dose GLP-1. Abstinence rather than moderation. Support rather than surveillance.

People in the UK are now spending 23 years sick before dying — and the United States holds the worst healthspan gap on earth

Lifespan is holding. Healthspan is collapsing.

In England, healthy life expectancy has fallen by roughly two years in the last decade. Men and women alike can expect about 60 years in good health — followed by roughly 23 years of chronic illness before death. "Health span is going down in the UK," Unwin says. "People are now spending roughly up to 23 years at the end of their lives with poor health and in sickness. This means the average person spends nearly a quarter of their life managing chronic illness."

In the United States, it is measurably worse. Despite lower overall life expectancy than comparable nations — and premature death rates nearly double the international average — Americans have the largest healthspan-to-lifespan gap on earth. "The US currently holds a rather grim record. It has the largest health span to lifespan gap on Earth."

The economic signal is unambiguous: every taxpayer in England pays an extra £7,000 per year for the consequences of ultra-processed food. Two-thirds of that figure isn't pharmaceutical costs — it's the drag from people too ill to work.

Unwin's frame is not about longevity. It's about compression — shrinking the sick years at the end. The choices made at 30 about carbohydrate, belly fat, and blood sugar testing are the primary lever on whether the 70s are active or managed. The disease starts silently, progresses invisibly, and announces itself as a surprise to people who assumed they were simply aging.

The feedback loop that could finally outrun the food industry is a $25 sensor on your arm

Continuous glucose monitors are the first genuinely democratic tool in this epidemic — cheap enough to give anyone the feedback that doctors and food companies spent decades withholding. Watch your blood spike in real time after a bowl of cornflakes, and the gap between packaging and biology becomes impossible to explain away. Unwin's teaspoon-of-sugar infographics now exist in 35 languages, translated by volunteers and freely distributed. The information is finally moving faster than the incentives that suppressed it. Whether the metabolic disease epidemic bends depends on how many people decide to look.

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Topics: metabolic health, type 2 diabetes, insulin resistance, fatty liver, low-carb diet, sugar, glycemic load, food addiction, ultra-processed food, health span, behavior change, nutrition, cancer prevention, magnesium, continuous glucose monitor