Sign inThe evidence
Every claim, and where it came from
The film makes 60 substantive claims. All of them are here, with a source, and marked according to how well the evidence actually supports them.
Consensus38
Settled scientific agreement. If you looked it up you would find the same thing.
Contested18
The literature genuinely disagrees, and the film argues one side of it. Some of these note where the film goes further than its source.
Synthesis4
The director's own inference. Not published, not peer-reviewed, and not presented as established.
Most documentaries state everything with the same confidence. This one does not, because the difference between a settled finding and an argument is the actual subject of the film.
Where the film overstates something, the note says so. There are a few. They are marked rather than quietly dropped, because a table that only confirmed what the film says would be worth nothing.
Corrections are welcome and will be published here. If something is wrong, or a source does not say what the note claims it says, write to colin@poshpork.com.
| Time | Claim | Status | Source / note |
|---|---|---|---|
| 01:00 | Three out of five people die from chronic inflammatory disease. | Consensus | Furman et al., Nature Medicine 25, 1822–1832 (2019). The paper groups stroke, chronic respiratory disease, heart disorders, cancer, obesity and diabetes as inflammation-related. It is a grouping of diseases in which inflammation plays a role, not deaths caused by inflammation alone. |
| 01:30 | Inflammation damaging the blood vessels to the heart causes heart attacks; in the brain, stroke, dementia and Alzheimer's. | Consensus | Inflammation is an established component of atherosclerosis (Libby, Nature 2002) and of neurodegenerative pathology (Heneka et al., Lancet Neurology 2015). |
| 03:00 | Saturated fat was blamed for heart attacks on the basis of studies that did not support the conclusion. | Contested | See the fuller entry at 45:00. One of the most actively disputed questions in nutrition science; the film argues one side of it. |
| 06:30 | Nearly a million people alive today are aged 100 or over; researchers classify roughly the top fifth as 'escapers' who reach 100 without major age-related disease. | Consensus | UN Population Division: 935,000 centenarians worldwide in 2024, up from 23,000 in 1950. Estimates vary by source — some 2025 figures give ~630,000 — because age verification at the extreme end is unreliable. The escaper / delayer / survivor classification: Evert, Lawler, Bogan & Perls, Journals of Gerontology 58A (2003), New England Centenarian Study. |
| 07:30 | You would need to eat roughly three times the weight of plant food to obtain the protein in an equivalent portion of meat. | Consensus | Straightforward from food composition tables. Pork ~25g protein per 100g; cooked legumes ~8–9g; tofu ~8g. |
| 08:00 | Plant protein is less available to the body than animal protein, and plant foods are typically limiting in at least one essential amino acid. | Consensus | FAO DIAAS scoring (2013). Cereals are limiting in lysine, legumes in methionine. Animal proteins score higher on digestibility and completeness. |
| 09:00 | Plants carry defences that interfere with digesting their protein. | Consensus | Protease inhibitors, lectins, phytate and tannins are well documented antinutritional factors in cereals and legumes. Most are substantially reduced by soaking, fermentation and cooking. |
| 09:30 | Phytic acid and tannins in plant foods bind minerals and reduce their absorption; they are also present in tea and coffee. | Consensus | Phytate inhibits zinc and iron absorption; tannins inhibit non-haem iron. Hurrell & Egli, American Journal of Clinical Nutrition 91 (2010). |
| 10:00 | In 1960s Iran, villagers eating adequate zinc suffered deficiency because unleavened bread's phytate blocked absorption; fermented bread did not have the same effect. | Consensus | Prasad et al. (1961, 1963) on zinc deficiency and dwarfism in Iranian villagers. Leavening and fermentation reduce phytate content. |
| 11:00 | Children's average height has stalled in some countries, including the UK, while children elsewhere continue to grow taller. | Consensus | NCD Risk Factor Collaboration, Lancet 396 (2020). UK height ranking has fallen relative to comparable countries over recent decades. |
| 12:00 | The liver can regrow in three to five years, and skin renews in a month. | Consensus | Heinke et al., Cell Systems 13 (2022) used retrospective radiocarbon birth dating to show human hepatocytes turn over continuously throughout life, keeping the liver an average age of under three years, independent of the person's age. Skin epidermal turnover is ~28–40 days. The film's three-to-five-year range sits at the upper end of the measured average. |
| 13:00 | The human body has no requirement for carbohydrate, but does require fat. | Consensus | Institute of Medicine, Dietary Reference Intakes (2005): the lower limit of dietary carbohydrate compatible with life is apparently zero, provided adequate protein and fat are consumed. Linoleic acid and alpha-linolenic acid are classified as essential fatty acids. |
| 14:30 | Industrially produced trans fats directly caused heart attacks and have since been banned. | Consensus | WHO REPLACE initiative (2018); FDA revocation of GRAS status for partially hydrogenated oils (2015); Mozaffarian et al., New England Journal of Medicine 354 (2006). |
| 15:00 | Nine in ten people are now deficient in omega-3. | Consensus | Stark et al., Progress in Lipid Research 63 (2016) and the 2024 world map update: only the Sea of Japan, Scandinavia and some non-Westernised populations average above an Omega-3 Index of 8%. Direct measurement found 95% of US family physicians (Current Developments in Nutrition) and 98% of a US/German sample (Nutrients) below 8%. Note that 8% is Harris and von Schacky's proposed cardioprotective target, not a formally established clinical deficiency threshold — no such threshold exists for EPA and DHA. |
| 15:30 | Omega-3 is anti-inflammatory; omega-6 in excess is not. | Consensus | EPA and DHA are precursors to resolvins and protectins, which actively resolve inflammation (Serhan, Nature 510, 2014). The inflammatory consequences of high omega-6 intake specifically are more debated than the anti-inflammatory role of omega-3. |
| 16:00 | Pork fat contains omega-3 as well as saturated fat. | Contested | True but quantitatively marginal. Pork fat contains small amounts of alpha-linolenic acid and, depending on the animal's feed, trace EPA and DHA. It is not a meaningful omega-3 source compared with oily fish. The film's wider point — that removing animal fat also removes these fats — holds; the implication that pork is a comparable source does not. |
| 16:15 | Vegetables contain no oil; seed oils are named misleadingly. | Consensus | A naming point rather than a scientific one, and accurate. 'Vegetable oil' is extracted from seeds — soybean, rapeseed, sunflower, cottonseed — not from vegetables. |
| 17:00 | There is a blood test for omega-3, and vegans are often below 4%. | Consensus | The Omega-3 Index measures EPA and DHA as a percentage of red blood cell fatty acids and is available as a consumer finger-prick test. Sarter et al., Clinical Nutrition 34 (2015), found a mean index of 3.7% in vegans, against a proposed cardioprotective target of 8%. Conversion of plant ALA to EPA runs at a few percent, and to DHA lower still. |
| 18:00 | Low omega-3 status carries a mortality risk comparable to smoking — a loss of ten, if not twenty, years. | Contested | McBurney et al., American Journal of Clinical Nutrition 114 (2021), Framingham Offspring cohort, found roughly 4.7 years' difference in life expectancy between the lowest and highest Omega-3 Index quintiles, and that Omega-3 Index performed comparably to smoking as a mortality predictor. The comparison to smoking is sourced; the ten-to-twenty-year figure overstates the measured difference. |
| 22:00 | Cooking pre-digested food, allowing the human digestive system to shrink and the energy saved to go to the brain. | Contested | Wrangham's cooking hypothesis (Catching Fire, 2009) and the expensive tissue hypothesis (Aiello & Wheeler, Current Anthropology 36, 1995). Both are influential and both are actively disputed; the timing of controlled fire use remains unsettled. |
| 23:00 | Dolphins are the only creature close to humans in brain-to-body ratio, and have the highest omega-3 levels in their blood of any creature. | Contested | The brain ratio is sound: the bottlenose dolphin's encephalization quotient of roughly 4.1–5.6 is second only to humans at 7.0–7.8, well above chimpanzees and orcas. The omega-3 superlative goes beyond the evidence. Harris & Ridgway (Prostaglandins Leukotrienes and Essential Fatty Acids, 2013) measured a mean Omega-3 Index of 19.9% in dolphins against 6.0% in humans, but state explicitly that the range in other mammals is unknown; no cross-species survey exists. The defensible version is that dolphins carry more than three times the omega-3 that humans do. Note also that DHA — the fatty acid concentrated in brain tissue — was near-identical in both species, 4.6% against 4.8%; the dolphins' advantage is almost entirely EPA. |
| 25:00 | Stable isotope analysis of nitrogen-15 in fossilised remains shows early humans ate predominantly animal protein. | Consensus | Richards & Trinkaus, PNAS 106 (2009), and the wider palaeodietary isotope literature. Trophic-level nitrogen-15 enrichment is well established. Note this describes the specific populations sampled — largely European Neanderthals and early modern humans — not all early humans everywhere. |
| 26:00 | Fructose was never meant to reach the liver in quantity, and people now send large amounts there. | Consensus | Hepatic fructose metabolism and de novo lipogenesis are well documented — Softic, Cohen & Kahn, Digestive Diseases and Sciences 61 (2016). Whole fruit delivers fructose slowly and with fibre; juice, blended fruit and added sweeteners deliver it quickly and in quantity. |
| 26:30 | Humans evolved to eat seasonal fruit in order to gain weight before winter. | Contested | Richard Johnson's fructose survival hypothesis (The Fat Switch, 2012; Johnson et al., Obesity 21, 2013). A published and serious hypothesis, not an established finding. |
| 27:30 | When you stop eating, the body enters a repair state, clearing damaged cells and using stored fat for energy. Constant snacking prevents this. | Consensus | Autophagy — cellular self-digestion and recycling, upregulated by nutrient deprivation — is established cell biology. Yoshinori Ohsumi received the 2016 Nobel Prize in Physiology or Medicine for elucidating its mechanisms. Insulin suppression of lipolysis between meals is standard endocrinology. |
| 27:45 | It takes about sixteen hours without food for this state to activate. | Contested | The timing, not the mechanism. Human autophagy is difficult to measure directly, and the sixteen-hour figure is extrapolated from animal work and indirect markers such as the glycogen-depletion-to-ketosis transition. Fasting thresholds in humans are not established and vary with prior meal composition, activity and individual metabolism. |
| 29:30 | Human genetics are over 99% the same now as a million years ago. | Consensus | Broadly accurate as a statement about genomic similarity, though the figure depends heavily on how difference is measured. The wider point — that the human genome has changed far less than the human food supply — is not disputed. |
| 30:00 | The fossil record shows early farmers were shorter and had smaller skulls than the hunter-gatherers who preceded them, indicating reduced capacity. | Contested | The skeletal changes are extensively documented — Cohen & Armelagos, Paleopathology at the Origins of Agriculture (1984); Mummert et al., Economics & Human Biology 9 (2011). Height reduction and increased dental disease at the agricultural transition are not in dispute. The inference from cranial size to intelligence is: cranial capacity is a poor proxy for cognitive ability and this inference is not supported by the literature. The director draws it; the evidence does not. |
| 31:00 | Britain industrialised first in part because it imported large quantities of high-quality animal protein and fat from Ireland. This raised omega-3 and nutrient intake among its population, and over generations contributed to the cognitive and physical capacity that industrialisation required. | Synthesis | ORIGINAL ARGUMENT — the director's own, not published, tested or peer-reviewed. The component facts are documented: large-scale Irish cattle and provisions exports to Britain through the sixteenth and seventeenth centuries; the Cattle Acts of 1663 and 1667, in which English landowners successfully pressured Parliament to ban Irish livestock imports; the subsequent Irish provisions trade in salted beef, butter and pork; and omega-3's established role in neurodevelopment. The causal chain connecting these to British industrialisation is the film's argument. It is offered for examination, not as a finding. |
| 32:00 | Over 100,000 cattle a year were imported into Britain, much of it from the Boyne Valley and surrounding areas of Ireland. | Synthesis | Part of the Ireland argument above. The figure is drawn from Colin Spencer, British Food: An Extraordinary Thousand Years of History (Grub Street) — page reference to follow. Large-scale Irish cattle exports in this period are documented, and the Cattle Acts of 1663 and 1667 banned them at the request of English landowners. Estimates elsewhere run lower, around 60,000 head annually in the 1660s, so the figure should be read as one historian's estimate rather than a settled number. |
| 33:00 | A study found soil quality alone accounts for around 30% of a country's IQ differences. | Contested | Sabit Erşahin, 'Exploring geospatial link between soils and national intelligence quotient', Scientific Reports (2025). Using a Soil Fertility Index, the study found soil fertility accounted for approximately 34% of the variation in national IQ scores, proposing iron, zinc and iodine availability as the pathway. The author stresses that correlation is not causation, warns of ecological fallacy, and describes the pathways as hypothetical and requiring further validation. Supporting mechanism: Feyrer, Politi & Weil on US salt iodisation, which raised IQ by roughly one standard deviation in the most iodine-deficient quarter of the population. |
| 35:00 | Vegetable oils were originally produced as industrial machine lubricants before entering the food supply. | Consensus | Cottonseed oil began as an industrial by-product and lubricant; Procter & Gamble's Crisco (1911) marked its transition into food. Documented in Fitzgerald, The Business of Food (2003). |
| 36:00 | A baby's IQ increases by 6% when breastfed. | Contested | Hou et al., Breastfeeding Medicine (2021), a network meta-analysis of 15 studies and 12,316 subjects, found children breastfed for more than 6 months scored 1.06-fold higher on intelligence tests than never-breastfed children (ratio of means 1.06, 95% CI 1.05–1.08); under 6 months gave 1.04. So the figure is precisely sourced. It remains Contested because the association is heavily confounded by maternal education and socioeconomic status, and sibling-controlled designs find smaller effects (Horta et al., Acta Paediatrica 104, 2015). The number is real; the causal attribution is what is disputed. |
| 37:00 | Once carbohydrate is in the blood, the body cannot burn fat. | Consensus | Insulin suppresses lipolysis and fatty acid oxidation. Standard endocrinology. Note the film's phrasing is absolute where the biology is a matter of degree — fat oxidation is suppressed, not switched off entirely. |
| 38:30 | Dr Clara Davis's orphanage study showed infants left to choose freely selected a nutritionally adequate diet, including a balance of fats and carbohydrates. | Contested | The study is real (Davis, American Journal of Diseases of Children, 1928–1939) and the outcomes reported are accurate. But every food offered was whole and unprocessed, and there were only 33–34 options. It demonstrates appetite operating within a constrained wholefood environment, not nutritional wisdom in general — a caveat the film makes. |
| 40:30 | Animals eat to a protein target; when protein is diluted, they overconsume total energy trying to reach it. | Contested | The protein leverage hypothesis — Simpson & Raubenheimer, Obesity Reviews 6 (2005). Well published, widely discussed, supported by experimental work in several species and some human trials. Not settled consensus. |
| 41:00 | One of the sweetest sugars, high-fructose corn syrup, is widely used across big food brands. | Consensus | Fructose is roughly 1.2–1.7 times as sweet as sucrose depending on temperature and concentration. HFCS is used in soft drinks, sports drinks, ketchup, crackers, bread, soups, cereals and spaghetti sauce — foods not traditionally sweetened (USDA Economic Research Service). US availability rose from its 1967 introduction to a peak of 63.7 pounds per person in 1999, while cane and beet sugar availability fell 33% over the same period. Note that HFCS is largely a United States phenomenon: in Europe it is quota-restricted as isoglucose, and sucrose is the usual sweetener. |
| 42:00 | Food companies deliberately market engineered products to children in order to establish lifelong preference. | Consensus | Extensively documented — WHO reports on food marketing to children; Moss, Salt Sugar Fat (2013), drawing on internal industry documents. |
| 44:00 | Correlation is not causation, and much nutritional epidemiology rests on it. | Consensus | Methodological point, not in dispute. On dietary recall specifically: Archer, Hand & Blair, Mayo Clinic Proceedings 90 (2015) on the validity of self-reported intake data. |
| 45:00 | There was never a sound scientific basis for the policy of reducing saturated fat intake. | Contested | One of the most actively disputed questions in nutrition science; the film argues one side. Supporting: Teicholz, BMJ 351:h4962 (2015), arguing the 2015 US Dietary Guidelines committee did not follow standard systematic review procedures; Ramsden et al., BMJ 353 (2016), recovered Minnesota Coronary Experiment data; Siri-Tarino et al., AJCN 91 (2010) meta-analysis. Opposing: Hooper et al., Cochrane Database (2020); AHA Presidential Advisory, Sacks et al., Circulation 136 (2017); WHO saturated fat guideline (2023). Context: more than 180 scientists demanded the BMJ retract Teicholz's article; after external review the BMJ declined, finding her criticisms fell within the realm of legitimate scientific discussion. That is a finding that the argument is admissible, not that it is correct. Teicholz issued a correction on one point in her published Rapid Response. |
| 46:30 | Type 2 diabetes is being reversed under medical supervision by removing carbohydrate, with patients coming off medication. | Consensus | Athinarayanan et al., Frontiers in Endocrinology 10 (2019) — two-year Virta Health outcomes; Lean et al., Lancet 391 (2018), the DiRECT trial, via calorie restriction. Remission is now an accepted clinical outcome. The optimal route remains debated. Medication changes must be supervised. |
| 47:30 | Serious mental illness, including schizophrenia, can be treated through metabolic and dietary intervention. | Contested | Metabolic psychiatry is a real and active field. Dr Chris Palmer (Harvard Medical School) has published case reports of schizoaffective disorder entering remission on a ketogenic diet (Schizophrenia Research 208, 2019) and set out the theory in Brain Energy (2022). A 2024 Stanford pilot (Sethi et al., Psychiatry Research) found psychiatric and metabolic improvement in schizophrenia and bipolar patients. The evidence is case series and small pilots, not controlled trials. Nobody should alter prescribed psychiatric medication except under medical supervision. |
| 48:00 | A high-fat, low-carbohydrate diet is beneficial in 70% of cancers, because cancer cells consume ten times more blood sugar than healthy cells. | Contested | The Warburg effect — elevated glucose uptake by tumour cells — is established and is the basis of PET imaging. The therapeutic inference is not. Thomas Seyfried's metabolic theory of cancer (Cancer as a Metabolic Disease, 2012) is a serious minority position with a growing preclinical literature and early human case reports, but the 70% figure is not supported by clinical trial evidence and no dietary protocol is established treatment for any cancer. Nobody should substitute diet for oncological care. |
| 60:30 | The bliss point is a deliberately engineered combination of sugar, salt and fat that maximises consumption while minimising nourishment. | Consensus | Howard Moskowitz's work, documented in Moss, Salt Sugar Fat (2013). Openly described by those who developed it. The 'minimising nourishment' framing is the film's characterisation of a commercial optimisation, not a stated industry goal. |
| 61:30 | Flavour enhancers signal protein to the tongue where little or no protein is present. | Synthesis | Umami compounds signal the presence of amino acids, and this is established taste physiology (Chaudhari & Roper, Journal of Cell Biology 190, 2010). Framing this as a decoy that defeats the protein appetite — and therefore drives overconsumption — is the director's inference, built on the protein leverage hypothesis above. |
| 63:00 | Children's bliss points are easier to find because they are still learning what food is. | Contested | Children do have heightened preference for sweetness, which declines through adolescence (Mennella et al., PLOS ONE 2011). That this makes commercial optimisation easier is a reasonable inference but not a documented industry finding. |
| 64:00 | Processed meat is classified as a group one carcinogen. | Consensus | IARC Monograph 114 (2015). Accurate, and raised in the film by the defence rather than the prosecution. Note that IARC classifies strength of evidence for a hazard, not magnitude of risk. |
| 66:30 | A seed naturally contains the vitamin needed to protect its own fat from oxidation, and the processed oil has much less. | Consensus | Vitamin E (tocopherols) protects polyunsaturated fats from peroxidation, and refining reduces tocopherol content. |
| 69:00 | Fat travels in the blood inside lipoprotein particles carrying triglycerides, cholesterol and fat-soluble vitamins. | Consensus | Standard lipid biology, not in dispute. |
| 70:00 | HDL returns damaged and excess cholesterol to the liver. | Consensus | Reverse cholesterol transport is established. Whether raising HDL is therapeutically beneficial is a separate and contested question. |
| 72:00 | Free radical attack cannot occur at a saturated fat, because there is no double bond for it to occur at. | Consensus | Basic lipid chemistry. Lipid peroxidation initiates by hydrogen abstraction at the bis-allylic position, which exists only in polyunsaturated fatty acids. Saturated fatty acids are not substrates for peroxidation. |
| 73:00 | The heart preferentially uses saturated fat for fuel. | Consensus | The heart derives 60–70% of its ATP from fatty acid oxidation under normal conditions (Lopaschuk et al., Physiological Reviews 90, 2010). The preference is for fatty acids generally rather than saturated fat specifically. |
| 74:00 | People eating ten times more seed oil than they should have tissue loaded with oxidisable fat, and this makes inflammation chronic. | Contested | The intake increase is documented — Blasbalg et al., AJCN 93 (2011): US soybean oil consumption rose roughly a thousand-fold across the twentieth century, and estimated linoleic acid intake rose from ~2% to ~7% of energy. Tissue incorporation of linoleic acid has risen correspondingly (Guyenet & Carlson, Advances in Nutrition 6, 2015). That this constitutes the fuel for chronic inflammatory disease is the film's argument, not an established finding. |
| 75:00 | Deep frying oxidises oils and produces toxic aldehydes; breaded fast foods absorb the most. | Consensus | Grootveld et al., Food Chemistry 75 (2001) and subsequent work on aldehyde formation in heated PUFA-rich oils. Higher absorption by coated foods follows from surface area and porosity. |
| 77:00 | Polyphenols from foods such as olives help protect fats from oxidative damage. | Consensus | Olive polyphenols including hydroxytyrosol have documented antioxidant activity; EFSA has approved a health claim for protection of blood lipids from oxidative stress. |
| 80:00 | Sugar is sticky and glycates proteins as the body processes it. | Consensus | Advanced glycation end-products and protein cross-linking are well documented (Gkogkolou & Böhm, Dermato-Endocrinology 4, 2012). |
| 82:00 | When carbohydrate is eaten, fat delivery to organs and muscles stops and the fat is directed to storage instead. | Consensus | Insulin simultaneously suppresses lipolysis and activates lipoprotein lipase in adipose tissue. Standard metabolic physiology. |
| 83:00 | The body converts excess energy into saturated fat, which it would not do if saturated fat were harmful. | Contested | The first half is established: de novo lipogenesis produces palmitate, a saturated fatty acid. The inference — that the body would not manufacture something harmful — is rhetorical rather than evidential. Elevated de novo lipogenesis is itself associated with metabolic dysfunction. |
| 84:00 | Ketones are a four-carbon fuel made in the liver that reach the brain quickly and do not need a carrier. | Consensus | Beta-hydroxybutyrate and acetoacetate are four-carbon molecules, water-soluble, and cross the blood-brain barrier via monocarboxylate transporters. Standard biochemistry. |
| 85:30 | The central argument: engineered additives drive overconsumption of both seed oil and refined carbohydrate. The seed oil loads body tissue and blood lipids with polyunsaturated fat, which is uniquely vulnerable to oxidation — the fuel. The excess carbohydrate overloads energy production and generates the free radicals — the match. Neither alone is sufficient. Together they produce chronic inflammation. | Synthesis | ORIGINAL ARGUMENT — the director's own, not published, tested or peer-reviewed. Each component is separately supported: additive-driven overconsumption (protein leverage; bliss point engineering), rising PUFA intake and tissue incorporation (Blasbalg 2011; Guyenet & Carlson 2015), lipid peroxidation chemistry, and substrate-overload reactive oxygen species generation (Brownlee, Nature 414, 2001; Murphy, Biochemical Journal 417, 2009). The proposition that these combine as a single interacting mechanism — and that this interaction, rather than any individual suspect, drives chronic inflammatory disease — is the argument the film exists to make. It is offered for examination, and the director welcomes correction. |
If you want to go further
The two rows marked Synthesis are the film's own arguments — the combination mechanism, and the Ireland thesis. Neither has been published or tested. They are the reason the film exists and the parts most likely to be wrong.
If you are a researcher, a clinician or simply somebody who reads this literature properly, I would rather hear from you than not.
Writing about the film? Everything else — stills, synopses, how it was made — is on the press page.
This film is for entertainment and education only. It is not medical advice, and nothing in it should replace a conversation with your doctor. Nobody should change prescribed medication on the strength of a film.