Nutrients

DiNicolantonio et al. (2018, Open Heart) documented that dietary magnesium intake has declined from approximately 500 mg/day in 1900 to 175 to 225 mg/day currently, a reduction of 50 to 65 per cent. The UK National Diet and Nutrition Survey (2019) found that 72 per cent of men and 59 per cent of women fail to meet the Reference Nutrient Intake for magnesium. Subclinical deficiency (serum Mg 0.75 to 0.85 mmol/L) is present in an estimated 10 to 30 per cent of the population.

This is because soil magnesium has declined due to intensive farming practices (reduced by 24 per cent in UK vegetables between 1940 and 2019, per McCance and Widdowson data). Food processing removes 80 to 95 per cent of magnesium from whole grains (white flour retains only 16 per cent of the whole grain's magnesium). Water treatment removes magnesium from tap water. Additionally, caffeine, alcohol, sugar, stress and PPIs all increase urinary magnesium excretion.

Magnesium is a cofactor for over 600 enzymatic reactions including ATP synthesis, DNA repair, protein synthesis and neurotransmitter production. Deficiency is associated with hypertension (OR 1.77, Dibaba et al., 2017), type 2 diabetes (RR 1.31, Dong et al., 2011), depression (OR 1.36, Tarleton et al., 2017), migraine (56 per cent of migraine sufferers are magnesium-deficient, Mauskop et al., 2012), insomnia and muscle cramps. It is the single most common mineral deficiency in the developed world.

Raw spinach contains approximately nine hundred and seventy milligrams of oxalic acid per one hundred grams, making it one of the highest-oxalate foods in the human diet. Oxalate binds calcium, iron and magnesium in the gut, forming insoluble salts that are excreted rather than absorbed.

The mineral bioavailability from spinach is therefore far lower than its raw nutrient content implies: the calcium in spinach is approximately five per cent bioavailable compared to over thirty per cent from dairy, due to oxalate binding. Cooking reduces oxalate by thirty to fifty per cent.

Spinach's reputation as an iron-rich food is partly misleading for this reason. The iron content is real; the bioavailable fraction reaching the bloodstream after oxalate interference and the competing effect of non-haem iron's lower absorption coefficient is substantially smaller.

The National Diet and Nutrition Survey finds that approximately one in five UK adults has serum 25-hydroxyvitamin D below 25 nmol/L, the threshold defining deficiency, with significantly higher rates in winter months and among people with darker skin pigmentation.

Vitamin D is produced primarily through ultraviolet B exposure to skin, not through food. The UK's northern latitude means UVB is insufficient for synthesis between October and March, yet modern indoor working patterns extend vitamin D depletion well into the summer months.

Deficiency is directly implicated in autoimmune disease susceptibility, impaired immune defence against infection, bone density loss and emerging evidence of cardiovascular risk. The correction costs pennies per day. The treatment of its consequences costs the NHS billions.

Analysis of National Diet and Nutrition Survey data published in 2021 found that ultra-processed foods contribute sixty-six per cent of total caloric intake in UK adolescents aged eleven to eighteen, the highest proportion of any age group studied.

UPF consumption at this level correlates with deficiencies in fibre, micronutrients and essential fatty acids alongside excess intake of added sugar, refined starch and industrial vegetable oils. The combination creates a state of simultaneous excess and malnutrition.

The adolescent diet shapes metabolic programming for adulthood. A cohort raised on sixty-six per cent UPF has different gut microbiome composition, different insulin sensitivity and different inflammatory baselines than any previous generation in British history.

DiNicolantonio et al. (2018, Open Heart, BMJ) reviewed historical and contemporary data on magnesium intake and found that per capita dietary magnesium has declined from approximately 500 mg/day in 1900 to approximately 200 mg/day in 2018, a reduction of sixty per cent. The RDA for adult men is 400 to 420 mg/day. NHANES data (2005 to 2006) indicated that sixty-eight per cent of American adults consumed less than the RDA for magnesium, with nineteen per cent consuming less than half the RDA.

This is because magnesium depletion has three converging causes: soil mineral depletion from intensive monoculture farming (Thomas 2007, documented twenty to forty per cent decline in Mg content across major vegetable crops between 1940 and 2002), food processing that removes magnesium-rich bran and germ from grains (white flour contains approximately twenty per cent of the magnesium in whole wheat), and water treatment that removes naturally occurring magnesium from municipal water supplies. A diet of refined grains, processed foods and filtered water delivers a fraction of the ancestral magnesium intake.

Magnesium is a cofactor for over 300 enzymatic reactions, including ATP synthesis, DNA repair, protein synthesis, neuromuscular function and blood glucose regulation. Subclinical deficiency is associated with hypertension, type 2 diabetes, metabolic syndrome, osteoporosis, depression and migraine. The magnesium supplement market reached $5.3 billion in 2023 (Grand View Research). The supplements address a deficiency created by removing magnesium from the food supply through processing and soil depletion.

Wild einkorn wheat (Triticum monococcum) is a diploid with fourteen chromosomes. Agricultural cultivation produced emmer wheat (tetraploid, twenty-eight chromosomes) and subsequently modern bread wheat (hexaploid, forty-two chromosomes), each hybridisation introducing new protein repertoires.

Modern wheat expresses gluten proteins from all three ancestral genomes simultaneously, producing a broader and more immunologically complex repertoire than ancient varieties. The specific high-molecular-weight glutenin subunits associated with coeliac pathology are absent or reduced in einkorn.

Humans have consumed wheat for ten thousand years, but in its current hexaploid form with Chorleywood processing for only sixty years. The immune system has had no equivalent evolutionary time to adapt to either the modern grain or the modern process.

Simopoulos's review of the scientific literature estimated that ancestral human diets maintained an omega-6 to omega-3 ratio of approximately one to one, while the contemporary Western diet produces ratios between fifteen to one and twenty to one.

Omega-6 and omega-3 fatty acids compete for the same elongase and desaturase enzymes. At high omega-6 to omega-3 ratios, the production of pro-inflammatory arachidonic acid metabolites is strongly favoured over the anti-inflammatory EPA and DHA metabolites.

The fifteen-to-one ratio is not a consequence of eating more omega-3 or a genetic adaptation. It is a product of seed oil dominance in the food supply over a period of sixty years, and it is reversible through dietary change.

UK food self-sufficiency peaked at approximately seventy eight percent in the mid-1980s. By 2024 it had declined to 65% overall. Fresh vegetable self-sufficiency hit a record low of 53%.

Fresh fruit self-sufficiency is 16%. Tomatoes: 15%. Potatoes fell from 74% to 62% in three years. The UK is increasingly dependent on imports for the most nutrient-dense categories.

Rickets was considered eradicated in Britain by the 1970s following post-war vitamin D fortification and improved nutrition. Symptomatic vitamin D deficiency incidence reached a nadir of 0.34 per 100,000 between 1991 and 1996, then rose twenty-two-fold to 7.5 per 100,000 by 2004 to 2005. The all-England incidence stabilised at 3.16 per 100,000 by 2007 to 2011, still nine times the nadir rate. By the period 2008 to 2012, approximately twenty per cent of UK adults and ten per cent of children aged four to ten were deficient in vitamin D.

Beef liver contains 4,968 mcg of retinol per 100g (USDA), 59.3 mcg of vitamin B12 (2,472% of the Reference Nutrient Intake), 9.76 mg of copper, 290 to 529 mcg of folate and 4.9 to 7.4 mg of haem iron. This is because organ meats, particularly liver, are among the only significant dietary sources of pre-formed vitamin A (retinol), which synergises with vitamin D in immune regulation and bone mineralisation. UK per capita offal consumption declined from approximately fifty grams per person per week in 1974 to approximately four grams by 2020, a fall of over ninety per cent.

The BSE crisis of 1989 to 1996 was the proximate cause of accelerated organ meat avoidance: the Specified Bovine Offal ban (1989) and the government's announcement of a probable causal link to vCJD (March 1996) collapsed consumer demand. The longer-term trajectory reflected genuine dietary change. Autoimmune disease incidence rose four per cent overall between 2000 and 2019 in the same period, with coeliac disease (IRR 2.19), Graves' disease (IRR 2.07) and Sjogren's syndrome (IRR 2.09) showing the steepest increases.

Between 48% and 57% of the US population consumes less magnesium than the estimated average requirement. Globally, 2.4 billion people are estimated to be magnesium inadequate.

UK selenium intake halved between the 1970s and early 2000s after bread wheat sourcing shifted from high-selenium North American grain to low-selenium European grain.

68% of UK schoolgirls were found to be iodine deficient in the Vanderpump 2011 Lancet study, a finding that surprised researchers because the UK has no iodisation programme.

40 to 60% of the population carry MTHFR polymorphisms that impair folate metabolism. Standard folic acid supplementation does not address this. These are not rare conditions. They are population-wide patterns.

Simopoulos (2002, Biomedicine and Pharmacotherapy) reviewed anthropological, epidemiological and biochemical data and concluded that the ancestral human omega-6 to omega-3 fatty acid ratio was approximately 1:1 to 2:1. The contemporary Western diet ratio is approximately 15:1 to 20:1, driven primarily by the introduction of industrial seed oils (soybean, corn, canola, sunflower) in the twentieth century. Seed oils now constitute the largest single source of calories in the American diet (approximately 8 per cent of total energy), up from near zero before 1900.

This is because omega-6 (linoleic acid) and omega-3 (alpha-linolenic acid) fatty acids compete for the same desaturase and elongase enzymes. When omega-6 predominates, the enzymatic pathway produces predominantly pro-inflammatory eicosanoids (PGE2, TXA2, LTB4) at the expense of anti-inflammatory and inflammation-resolving mediators (PGE3, resolvins, protectins). A 20:1 ratio means the pro-inflammatory pathway runs at near-maximum capacity while the resolution pathway is substrate-starved. The biochemistry is straightforward: this is the upstream driver of chronic systemic inflammation.

Chronic inflammatory diseases (cardiovascular disease, type 2 diabetes, autoimmune conditions, depression, cancer) have risen in parallel with the omega-6 to omega-3 ratio over the past century. Anti-inflammatory drugs (NSAIDs, corticosteroids, biologics) represent a combined global market exceeding $90 billion. These drugs suppress downstream inflammatory mediators while the upstream dietary imbalance continues unopposed. Restoring an ancestral ratio through seed oil elimination and omega-3 rich foods (wild fish, grass-fed meat, pastured eggs) addresses the cause rather than the consequence.

UK organ meat consumption, including liver, kidney and heart, declined from approximately sixty grams per person per week in 1950 to under four grams by 2020, a reduction of over ninety-three per cent according to National Food Survey data. Over the same period, type 2 diabetes prevalence rose from under one per cent to approximately five and a half per cent of the UK population, a fifteenfold increase confirmed by the British Regional Heart Study, CPRD and NHS QOF datasets.

The inverse trajectories are not offered here as proof of causation. They are presented as a dimensional relationship that public health discourse has not engaged with. Organ meats are among the most nutrient-dense foods in the human diet: concentrated sources of B vitamins, fat-soluble vitamins A, D and K2, choline, zinc and bioavailable iron. Their replacement by ultra-processed food did not merely swap one food for another. It removed a category of nutrient concentration that has no equivalent in the modern food supply.

Type 2 diabetes is a condition of metabolic dysregulation with multiple contributing factors. The correlation with organ meat decline is a feature of the same post-war nutrition transition that replaced traditional animal foods with industrial alternatives. Whether the specific micronutrient profile of organ meats has a protective role in metabolic health is a research question that has not been studied in a controlled trial, making it a commercially inconvenient gap in the evidence record.