HoldsUp

David Unwin

National Health Service (NHS)

David Unwin is a general practitioner working within the National Health Service (NHS). His work focuses on metabolic health and the management and remission of type 2 diabetes through dietary interventions. His published research investigates the clinical applications and safety of ketogenic and low-carbohydrate diets, intermittent fasting, insulin resistance, and their effects on obesity, hypertension, and nonalcoholic fatty liver disease.

52 claims checked on air: 3 context 1 overstated 30 supported 18 unverified 1 flagged

What they said on air - supported

3 citing their own research

0:00:00supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

A person's waist circumference should measure less than half of their height.

"Your waist should be less than half your height. So, half of that string should go around the fattest bit of your belly." (said at 0:00:00)

The recommendation that waist circumference should be less than half of an individual's height (a waist-to-height ratio < 0.5) is supported by robust public health evidence and systematic reviews. Meta-analyses covering hundreds of thousands of adults across multiple global populations demonstrate that a waist-to-height ratio threshold of 0.5 is an effective boundary value for identifying cardiometabolic risk factors, diabetes, and cardiovascular disease, outperforming both body mass index (BMI) and waist circumference alone. Public health authorities, including the UK National Institute for Health and Care Excellence (NICE), explicitly recommend this threshold.

0:00:10supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Fat accumulated on the abdomen poses greater health risks than fat on the legs or arms.

"But fat on your belly is more worrying than fat on your legs or on your arms." (said at 0:00:10)

Large-scale prospective cohort evidence and systematic reviews consistently demonstrate that central (abdominal) adiposity is associated with increased all-cause mortality and adverse cardiometabolic outcomes, whereas peripheral fat depots in the legs and lower body are either neutral or protective. A meta-analysis of 72 prospective cohort studies involving over 2.5 million participants found that measures of central fatness (such as waist circumference and waist-to-hip ratio) significantly increased all-cause mortality risk, whereas larger hip and thigh circumferences were associated with lower mortality risk. Observational and metabolic studies using dual-energy X-ray absorptiometry (DXA) further show that peripheral lower-body fat correlates favorably with insulin sensitivity, blood lipid profiles, and adiponectin levels.

0:00:15supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Approximately one-third of all people in the world with type 2 diabetes are undiagnosed.

"And maybe a third of all the people in the world with type 2 diabetes don't even know they have it." (said at 0:00:15)

Global epidemiological surveillance data from the International Diabetes Federation (IDF) Diabetes Atlas demonstrates that a substantial fraction of adults with diabetes are undiagnosed worldwide. Recent global estimates indicate that approximately 43% to 50% of all adults living with diabetes globally (and roughly 24% to 29% in high-income countries) are unaware of their condition. The speaker's estimate of 'maybe a third' accurately reflects the massive undiagnosed burden and is slightly conservative relative to the global average.

0:06:11supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Chronically high blood sugar damages blood vessel walls over time.

"because we know uh that a high blood sugar over time damages your arteries. So, it's a cumulative thing over time." (said at 0:06:11)

Extensive clinical and mechanistic evidence demonstrates that chronic hyperglycemia causes cumulative structural and functional damage to blood vessel walls. Sustained high glucose levels trigger endothelial dysfunction, oxidative stress, inflammation, and advanced glycation end products (AGEs), driving both microvascular disease and macrovascular atherosclerosis over time.

0:06:30supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Cancer is a rising cause of mortality among people diagnosed with diabetes.

"what you may not know is that actually a rising cause of mortality for people with diabetes is cancer." (said at 0:06:30)

Large-scale epidemiological studies confirm that cancer has become a leading and proportionally rising contributor to mortality in individuals diagnosed with diabetes. Substantial declines in cardiovascular disease death rates over recent decades have shifted the primary mortality burden in people with diabetes from vascular causes toward cancer and other non-vascular conditions across multiple high-income countries.

0:06:41supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Eight forms of cancer are strongly associated with diabetes.

"Eight forms of cancer uh are strongly associated uh with diabetes." (said at 0:06:41)

Large-scale epidemiological meta-analyses and umbrella reviews consistently report that type 2 diabetes is associated with an increased risk of several site-specific cancers, with strong or highly suggestive evidence typically identified for 6 to 8 specific malignancies. An umbrella review published in Cancer Epidemiology, Biomarkers & Prevention (PMID: 33737302) found robust observational evidence linking type 2 diabetes to increased risk of colorectal, hepatocellular, gallbladder, breast, endometrial, and pancreatic cancers, alongside Mendelian randomization evidence implicating diabetes or hyperinsulinemia in endometrial, pancreatic, kidney, breast, lung, and cervical cancers. An earlier landmark BMJ umbrella review (PMID: 25555821) similarly established robust evidence for at least 6 to 7 cancer sites (including breast, colorectal, endometrial, gallbladder, and biliary cancers).

0:07:22supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Research demonstrates that very high blood sugar damages the endothelial glycocalyx lining of arteries within six hours.

"And in fact, there's work to show that a very high blood sugar damages the nonstick lining of your arteries within 6 hours. Really quick. It's called the glycocalyx, the nonstick lining." (said at 0:07:22)

Research directly supports the claim that acute, severe hyperglycemia damages the endothelial glycocalyx within six hours. In a crossover clinical study of 10 healthy male subjects undergoing a 6-hour normoinsulinemic hyperglycemic clamp, systemic glycocalyx volume decreased by approximately 50% (from 1.7 L to 0.8 L, P < 0.05). This reduction was accompanied by markers of glycocalyx shedding (increased plasma hyaluronan levels), impaired endothelial function, and activation of coagulation.

0:09:58supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Approximately one-third of the population in the developed world has non-alcoholic fatty liver disease.

"So we have well, it's a third of everybody in the developed world has fatty liver now." (said at 0:09:58)

Epidemiological data and meta-analytic reviews indicate that non-alcoholic fatty liver disease (NAFLD), now commonly classified as metabolic dysfunction-associated steatotic liver disease (MASLD), affects approximately 30% to 38% of the global adult population, with similar or higher rates reported across developed nations. The claim accurately reflects contemporary epidemiological consensus estimates.

0:11:10supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Accumulation of fat in the liver interferes with insulin action, leading to insulin resistance.

"Now the twist in the story is fatty liver interferes with the good work of insulin. So you develop a thing called insulin resistance, which means your insulin is no longer as powerful as it was." (said at 0:11:10)

Extensive physiological and mechanistic evidence confirms that ectopic lipid accumulation in the liver interferes with insulin signaling and promotes insulin resistance. Elevated intrahepatic lipid stores lead to the accumulation of lipotoxic intermediates, particularly membrane sn-1,2-diacylglycerols (DAGs), which recruit and activate protein kinase C epsilon (PKCε). Activated PKCε phosphorylates the insulin receptor kinase (e.g., at Thr1150), inhibiting its catalytic activity and impairing downstream insulin signaling, which reduces hepatic insulin sensitivity and impairs insulin-mediated suppression of hepatic glucose production.

0:11:58supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

According to Professor Roy Taylor's research, hepatic steatosis typically persists silently for approximately 10 years before pancreatic beta-cell dysfunction leads to overt type 2 diabetes.

"This bit's called the long silent scream from the liver. This is work by Professor Roy Taylor, a friend of mine at Newcastle University. And he pointed out that you've you've got fatty liver for about 10 years. You don't even know." (said at 0:11:58)

Professor Roy Taylor's 'Twin Cycle Hypothesis' describes the pathophysiology of type 2 diabetes as a two-stage process driven by chronic positive calorie balance. Excessive fat accumulates silently in the liver over many years (typically around a decade), causing hepatic insulin resistance and hyperinsulinemia. This leads to increased export of triacylglycerol via VLDL to peripheral tissues, including the pancreas. Eventually, fat accumulation inside the pancreas impairs beta-cell function and insulin secretion, resulting in overt clinical type 2 diabetes. Research by Taylor and colleagues demonstrated that substantial dietary weight loss reverses this sequence, normalizing liver fat content and restoring first-phase insulin secretion.

0:12:30supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

In the progression of type 2 diabetes, ectopic fat accumulation in the pancreas causes beta-cell dysfunction and the eventual collapse of adequate insulin production.

"fat is being laid down in the pancreas gland, the very gland that your life depends upon producing insulin. And your ability to produce enough insulin collapses." (said at 0:12:30)

Clinical and metabolic evidence supports the claim that ectopic fat accumulation in the pancreas contributes to beta-cell dysfunction and impaired insulin secretion in the progression of type 2 diabetes. Under the twin-cycle hypothesis, chronic positive energy balance leads to lipid export from the liver to the pancreas, causing intra-pancreatic fat accumulation, beta-cell dedifferentiation, and loss of adequate insulin secretion (particularly first-phase insulin response). Human intervention studies, including sub-analyses of the Diabetes Remission Clinical Trial (DiRECT), show that targeted weight loss reduces intra-pancreatic fat and restores functional beta-cell capacity and insulin secretion, while weight regain leads to re-accumulation of pancreatic fat and loss of beta-cell function.

0:13:30supportedvery lowtheir own paperFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

In Dr. David Unwin's practice cohort, patients with early-stage type 2 diabetes achieved a 73% remission rate on a low-carbohydrate diet, which dropped to 50% if the condition had persisted for 5 years.

"At that point, if I can get you early, I've got a 73% chance of you having a normal blood sugar. Let's wait another few years because you don't want to give up bread and you don't want to give up chips and pizza. Fair enough, I'll wait. But, you know, if we wait 5 years, you only stand a 50% chance." (said at 0:13:30)

In an 8-year service evaluation of Dr. David Unwin's general practice cohort (Norwood Surgery, n=186) utilizing a lower-carbohydrate diet, drug-free type 2 diabetes remission was achieved in 77% of patients with disease duration under 1 year, and overall remission across the whole cohort was 51% (with remission rates progressively declining with longer disease duration, reaching 20% after 15 years). Because this evidence comes from an uncontrolled, observational general practice service evaluation/cohort of self-selected patients, the GRADE certainty for this finding is very low.

0:44:10supportedmoderatetheir own paperFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

A 150-gram serving of boiled white rice has a glycemic load equivalent to 10 four-gram teaspoons of sugar.

"This is 150 grams of boiled rice. Three, four, five, six, seven, eight, nine, and 10. So, that's the winner." (said at 0:44:10)

Dr. David Unwin and colleagues developed communication infographics (published in clinical diabetes literature and endorsed by organizations like NICE in educational contexts) translating the glycemic load (GL) of carbohydrate foods into equivalent 4 g teaspoons of table sugar (sucrose) based on relative glycemic response / glucose equivalents. Under standard glycemic index (GI) and glycemic load calculations, a 150 g portion of boiled white rice contains approximately 42–45 g of available carbohydrate with a GI around 70–73, resulting in a glycemic load of ~30–33 g glucose equivalents. Because 1 g of table sugar (sucrose, GI ~65) has a glycemic impact lower than pure glucose, 10 four-gram teaspoons of table sugar (40 g sucrose, GL ~26–28) or ~8–10 teaspoons produces an equivalent blood glucose response to 150 g of boiled white rice in clinical educational models.

0:45:43supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Consuming juiced fruit causes a rapid increase in blood sugar and an insulin response that leads to a subsequent blood sugar drop, driving hunger.

"once you take it from the fruit as it was meant to be and you juice it, the sugar hit is fast. So, what that does is if you think if we go back to insulin again, [snorts] so you drink the orange juice, your blood sugar goes up rapidly. So, your body responds rapidly with insulin. Then, what happens? Your blood sugar falls. But then you're kind of hungry again." (said at 0:45:43)

Comparative physiological studies show that consuming fruit in liquid or juice form leads to faster ingestion, larger insulin responses, and subsequent postprandial rebound falls in blood glucose compared to intact whole fruit, accompanied by significantly lower feelings of fullness and earlier return of hunger.

0:50:24supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

In a human body with normal blood sugar, the entire 5 liters of blood contains only approximately one sugar cube (about 4 grams) of total dissolved glucose.

"If you have a normal blood sugar, I would like you to guess how much sugar is there in my entire blood system... That is all there is... One sugar cube. That's all." (said at 0:50:24)

Under normal fasting physiological conditions (euglycemia of approximately 80–100 mg/dL or ~5 mM), an adult with a typical blood volume of approximately 5 liters has about 4 grams of dissolved glucose circulating in the vascular system, which is equivalent to approximately one standard sugar cube or one teaspoon of sugar.

0:58:20supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Salivary amylase breaks down dietary starch into simple sugars.

"A schoolboy experiment that's done a lot to prove that the amylase, the enzyme in spit, turns starch into sugar. But that's the point. Starch is soon to be sugar. It's glucose holding hands." (said at 0:58:20)

Salivary alpha-amylase is well-established as the primary enzyme that initiates the enzymatic breakdown of dietary starch into simpler carbohydrates and sugars in the oral cavity.

1:05:05supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Dietary fats are necessary for the absorption of fat-soluble vitamins.

"And then fats. Well, you might need those for fat-soluble vitamins." (said at 1:05:05)

Dietary fats are essential for the physiological digestion, micellar solubilization, and absorption of fat-soluble vitamins (vitamins A, D, E, and K). Impairment in dietary lipid intake or fat digestion/absorption (such as exocrine pancreatic insufficiency or bile acid disorders) leads directly to fat-soluble vitamin malabsorption and deficiencies.

1:08:57supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Dr. Ian Campbell at Edinburgh University is conducting research on dietary and nutritional psychiatry interventions for bipolar disorder.

"Ian Campbell in Edinburgh University is doing some amazing work with bipolar disorder and other things." (said at 1:08:57)

Dr. Iain Campbell at the University of Edinburgh leads research investigating metabolic and dietary interventions, specifically ketogenic metabolic therapy, for bipolar disorder. His team has published feasibility and clinical pilot studies demonstrating that a modified ketogenic diet is feasible in individuals with bipolar disorder and is associated with improvements in metabolic markers, brain glutamate/glutamine levels measured via magnetic resonance spectroscopy, and ecological momentary assessments of mood, energy, anxiety, and impulsivity.

1:30:41supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Approximately 14% of the general population has some aspects of ultra-processed food addiction.

"And she would say about 14% of the population has some aspects of ultra-processed food addiction." (said at 1:30:41)

The speaker's statement accurately reflects published research by Dr. Ashley Gearhardt and colleagues. In a 2023 analysis published in the BMJ (PMID: 37813420), the authors reviewed systematic review data applying the Yale Food Addiction Scale (YFAS) and reported that the estimated prevalence of food addiction (primarily driven by ultra-processed foods high in refined carbohydrates and fats) is approximately 14% in adults (and 12% in children). Meta-analyses of YFAS surveys across general and non-clinical populations consistently find prevalence estimates in this range (14% to 20%).

1:51:02supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Two-thirds of the economic cost of diet-related illness in the UK is due to lost tax revenue and workforce absence rather than direct healthcare/drug costs.

"And this is because it's not just the cost of the drugs. The bigger cost is the people not paying tax themselves and not able to work because they're ill. And that's two-thirds of the cost is the lack of revenue because so much of our population isn't well enough to work." (said at 1:51:02)

Economic evaluations and cost-of-illness studies of unhealthy diets and related chronic metabolic conditions (such as obesity and type 2 diabetes) consistently show that wider societal and indirect costs—primarily driven by lost economic productivity, workforce absence/inactivity, and lost tax revenue—are roughly double the direct costs to healthcare services (such as hospital care and drug prescriptions). An indirect-to-direct cost ratio of approximately 2:1 means that indirect economic losses represent about two-thirds (~67%) of the total economic burden.

1:52:08supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Having a waist circumference less than half your height is a recognized screening measure for good metabolic health.

"And so one recognized way looking at metabolic health is your waist should be less than half your height." (said at 1:52:08)

A waist circumference of less than half one's height (a waist-to-height ratio < 0.5) is a widely recognized clinical screening cut-off for identifying healthy central adiposity and lower cardiometabolic risk. Systematic reviews, meta-analyses covering hundreds of thousands of individuals across multiple populations, and public health bodies (such as the UK National Institute for Health and Care Excellence, NICE) support a waist-to-height ratio under 0.5 as an effective screening threshold for predicting type 2 diabetes, hypertension, dyslipidemia, and cardiovascular disease.

1:52:36supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Magnesium citrate has an osmotic laxative effect and is used to relieve constipation.

"If you tend to be a bit constipated, magnesium citrate is very good. It's more laxative. And you absorb some of it anyway." (said at 1:52:36)

The speaker's statements that magnesium citrate works as a laxative helpful for constipation and is partially absorbed are well supported. Magnesium citrate is an established hyperosmotic laxative widely used for bowel evacuation, fecal disimpaction, and constipation management. In randomized and comparative clinical trials, magnesium citrate has demonstrated significant in vivo bioavailability, resulting in measurable increases in systemic serum and urinary magnesium concentrations alongside its osmotic gastrointestinal activity.

1:53:45supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Magnesium absorption declines with age, and medications that reduce stomach acid interfere with magnesium absorption.

"And as you get older, you absorb the magnesium less and less. Also, a lot of medication interferes with magnesium absorption, particularly drugs for acidity." (said at 1:53:45)

Both components of the claim are supported by the literature. Intestinal magnesium absorption declines with age alongside other physiological shifts such as reduced dietary intake and renal wasting, contributing to total-body magnesium deficits in older adults. Furthermore, medications used to suppress gastric acid—most notably proton pump inhibitors (PPIs)—are well-established causes of impaired intestinal magnesium absorption and hypomagnesemia, mediated by altered luminal pH, reduced magnesium solubility, and downregulation of intestinal transport proteins (such as TRPM6).

1:53:47supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

In cattle, magnesium deficiency from low-magnesium forage causes 'grass staggers' (hypomagnesemic tetany), which manifests as fatal convulsions if untreated.

"the farmer said, "You can have whichever cow you like, but I've lost 15 cows to a thing called the staggers this year, and you cannot have the cow unless you promise me you'll buy magnesium supplements because the grass is now so short of magnesium that cows die fitting if you don't give them a magnesium supplementation."" (said at 1:53:47)

Grass staggers (hypomagnesemic tetany or grass tetany) is a well-established, life-threatening metabolic disorder in cattle. Ruminants lack hormonal regulation to maintain blood magnesium homeostasis, relying entirely on continuous dietary absorption. When cattle graze on forage with insufficient or poorly absorbed magnesium (often exacerbated by high potassium levels in lush spring pasture), severe hypomagnesemia develops. This leads to spontaneous neuromuscular excitation, severe muscle spasms, convulsions ('fitting'), and rapid death if left untreated. Preventive oral magnesium supplementation is standard veterinary practice.

1:54:10supportedvery lowFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Magnesium glycinate and magnesium threonate cross the blood-brain barrier.

"particularly if you're wanting better sleep or mood, magnesium glycinate or threonate crosses the blood-brain barrier, but won't help with constipation." (said at 1:54:10)

Preclinical animal research demonstrates that magnesium L-threonate crosses the blood-brain barrier and significantly elevates cerebrospinal fluid and brain magnesium concentrations, leading to enhanced synaptic plasticity and cognitive function. Evidence for magnesium glycinate's comparative brain penetration is more modest, although organic magnesium compounds and magnesium ions utilize active transport across the blood-brain barrier. Direct human evidence confirming selective blood-brain barrier permeability differences between these forms remains limited, as the primary pharmacokinetic data derive from rodent models.

1:55:32supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Severe magnesium deficiency (hypomagnesemia) in humans, which can be triggered by specific medications, can present with seizures and convulsions.

"Why was he fitting? And I expect you've joined the dots. It was magnesium deficiency because of medication he was on." (said at 1:55:32)

Severe hypomagnesemia is a well-recognized cause of neuromuscular hyperexcitability, which can manifest clinically as tetany, convulsions, and generalized seizures. Multiple medication classes are established causes of severe magnesium depletion through impaired renal reabsorption or reduced intestinal absorption, notably long-term proton pump inhibitors (PPIs), loop and thiazide diuretics, calcineurin inhibitors, and aminoglycosides.

1:55:33supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Serum magnesium testing does not accurately reflect total body magnesium status because most magnesium resides intracellularly.

"So, your blood magnesium, serum magnesium, doesn't reflect what's going on because magnesium is mainly inside your cells. So, you have to get the intracellular magnesium level." (said at 1:55:33)

Serum magnesium concentrations do not reliably reflect total body magnesium stores because less than 1% of the body's total magnesium resides in the extracellular fluid/serum, while more than 99% is located intracellularly and in bone. Published studies and reviews consistently confirm that normal serum magnesium levels can coexist with intracellular or tissue magnesium depletion.

2:01:28supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

In the UK, health inequalities worsen as one moves northwards.

"And it also, if you start in the UK and you go northwards, it just gets worse and worse." (said at 2:01:28)

Extensive epidemiological and demographic registry data in the United Kingdom demonstrate a persistent north-south gradient in health outcomes and mortality. Moving northwards across England, regions such as the North East, North West, and Yorkshire and the Humber experience consistently higher premature and all-cause mortality rates and lower life expectancies compared with London and the South of England, a disparity driven largely by socioeconomic differences and post-industrial economic decline.

2:09:11supportedhighFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Acute psychological stress raises blood glucose levels.

"It also means if I get very stressed, it puts up my blood sugar." (said at 2:09:11)

Acute psychological and physiological stress triggers neuroendocrine pathways—principally the sympathetic nervous system, the hypothalamic-pituitary-adrenal (HPA) axis, and direct neural projections to the liver—that stimulate hepatic gluconeogenesis and glycogenolysis while inducing temporary insulin resistance, rapidly raising blood glucose levels. Human experimental studies using standardized stress paradigms (such as the Trier Social Stress Test) confirm that acute psychological stress increases blood glucose concentrations or delays postprandial glucose clearance in individuals with and without metabolic disorders.

2:09:51supportedmoderateFatty Liver Expert: The Toxic Ingredient Silently Filling Yo

Type 2 diabetes has historically not been a pediatric disease and has recently emerged as an international health problem among children.

"So type 2 diabetes is brand new as a problem for pediatricians... The international problem is that children everywhere are now suffering from type 2 diabetes." (said at 2:09:51)

Type 2 diabetes was historically considered an adult-onset metabolic condition, but epidemiological reviews confirm that youth-onset type 2 diabetes has emerged globally as a serious pediatric public health concern over recent decades. This trend has tracked closely with rising rates of pediatric obesity, characterized by a more aggressive disease phenotype and rapid development of microvascular and cardiovascular complications compared to later-onset disease.

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