Raw Nutrition

Holstein-Friesian cattle, comprising 78% of the UK dairy herd, produce A1 beta-casein, which releases a seven-amino-acid opioid peptide called beta-casomorphin-7 (BCM-7) during digestion. A double-blind crossover trial in 45 subjects found that A1 milk significantly increased intestinal inflammation markers, slowed gastrointestinal transit, elevated IL-4 (P<0.0001) and impaired cognitive processing speed compared to A2 milk. Human breast milk, goat milk and sheep milk all contain exclusively A2 beta-casein.

BCM-7 binds to mu-opioid receptors in the gut wall, slowing motility and promoting inflammatory immune responses including elevated IgE and myeloperoxidase activity. Jersey and Guernsey cattle produce A2 casein, which does not release this peptide during digestion. Many people who believe they are lactose intolerant may instead be reacting to A1 beta-casein from the dominant commercial breed.

A 2020 meta-analysis of eight European studies found that early-life raw milk consumption is associated with a 42% reduction in childhood asthma (OR 0.58, 95% CI 0.49 to 0.69). The protective effect was observed equally in farm children and non-farm rural children, confirming the benefit comes from the milk itself rather than broader farm exposures. Three heat-sensitive whey proteins, bovine serum albumin, alpha-lactalbumin and beta-lactoglobulin, were identified as the likely protective agents.

The GABRIELA study of 8,334 children found that boiled farm milk provided no protection, while unboiled farm milk reduced asthma risk by 41% (aOR 0.59). Bovine serum albumin showed the strongest individual association, with a 47% risk reduction at the highest concentration. These whey proteins denature above 65°C, which means standard pasteurisation removes precisely the components responsible for protection.

Ballard and Morrow (2013) reviewed the composition of human breast milk and identified over 1,000 proteins, 200+ oligosaccharides (HMOs), secretory IgA antibodies, lactoferrin, lysozyme, stem cells, microRNAs, live immune cells, growth factors (EGF, TGF-β, IGF), hormones (leptin, adiponectin, cortisol, melatonin) and a dynamically changing fatty acid profile. The total count of bioactive components exceeds 1,500. Infant formula contains approximately 40 to 50 nutrients.

Human milk oligosaccharides (HMOs) are the third most abundant solid component of breast milk after lactose and fat. The infant cannot digest them. They exist exclusively as food for Bifidobacterium infantis, the keystone species of the infant gut microbiome. Formula contains no HMOs (until very recently, when a single synthetic HMO was added to premium brands). Colonisation with B. infantis reduces gut inflammation, improves immune development and prevents pathogen adhesion.

Breast milk composition changes hour by hour (higher cortisol in morning milk, higher melatonin at night to entrain infant circadian rhythm), week by week (colostrum to transitional to mature) and in real-time response to infant illness (retrograde milk flow from infant saliva into the nipple triggers specific antibody production within hours). Formula is the same at every feed.

Glycine is the most abundant amino acid in the human body but is conditionally essential: de novo synthesis produces only 3g per day while metabolic demand is approximately 10 to 13g (Meléndez-Hevia et al. 2009). Properly prepared bone broth (24-hour simmer with vinegar) yields approximately 12g of glycine per litre, primarily from hydrolysed collagen (gelatin). De Paz-Lugo et al. (2018) showed that glycine supplementation at 10g/day improved collagen synthesis markers in osteoarthritis patients.

Glycine serves as a precursor for glutathione (the master intracellular antioxidant, requiring glycine, cysteine and glutamate), creatine synthesis (consuming approximately 1.7g/day of glycine), haem synthesis, bile salt conjugation, nucleic acid synthesis and neurotransmission (glycine is an inhibitory neurotransmitter in the brainstem and spinal cord). Bannai et al. (2012) demonstrated in an RCT that 3g of glycine before bed improved subjective sleep quality and reduced daytime sleepiness.

Until the mid-20th century, Western households routinely made stock from bones. The practice provided a continuous supply of glycine, proline, hydroxyproline and minerals (calcium, magnesium, phosphorus) in a highly bioavailable, gelatinous matrix. Modern cooking has replaced bone stock with bouillon cubes containing maltodextrin, seed oils and flavour enhancers. The glycine deficit is now structural.

Natto, produced by fermenting soybeans with Bacillus subtilis, contains approximately 1,100 mcg of vitamin K2 (menaquinone-7) per 100g, the highest concentration of any food. Gast et al. (2009, Nutrition, Metabolism and Cardiovascular Diseases) analysed 16,000 women in the PROSPECT-EPIC cohort and found that each 10 mcg increase in dietary vitamin K2 (not K1) was associated with a 9% reduction in coronary heart disease risk. K1, abundant in leafy greens, showed no cardiovascular benefit.

This is because vitamin K2 activates matrix Gla-protein (MGP), a potent inhibitor of arterial calcification. Without adequate K2, calcium deposited in soft tissues cannot be redirected to bones and teeth. Knapen et al. (2015, Thrombosis and Haemostasis) demonstrated in a randomised controlled trial that 180 mcg/day of MK-7 supplementation for three years significantly improved arterial stiffness (measured by carotid femoral pulse wave velocity) in healthy postmenopausal women.

The traditional Japanese practice of daily natto consumption may partially explain the "Japanese paradox": high rates of smoking yet relatively low rates of cardiovascular disease. Modern Western diets, which replaced traditional fermented foods with pasteurised and industrially processed alternatives, eliminated the primary dietary sources of K2. The vitamin is also produced by grass-fed animal liver, aged cheese and egg yolks from pastured hens, all foods that declined with industrialisation.

Lopez et al. (2001, Journal of Agricultural and Food Chemistry) demonstrated that traditional long-fermentation sourdough (48 hours) reduced phytic acid content by up to 90%, compared to commercial yeast bread which reduces phytic acid by only 20-30%. Phytic acid binds to zinc, iron, calcium and magnesium in the gut, preventing their absorption. A standard slice of commercial bread contains enough phytic acid to inhibit absorption of the minerals it ostensibly provides.

This is because the lactobacilli and wild yeasts in sourdough starter produce phytase enzymes during long fermentation. These enzymes break down phytic acid into inositol and free phosphate, liberating the bound minerals. Industrial bread production, which uses commercial yeast and completes fermentation in 1-3 hours, does not allow sufficient time for phytase activity. The Chorleywood Bread Process (used for 80% of UK bread) completes fermentation in under 20 minutes.

The consequences are measurable. Liljeberg et al. (1995, European Journal of Clinical Nutrition) found that traditional sourdough bread produced a 50% lower glycaemic response than identical bread made with commercial yeast. Poutanen et al. (2009, Trends in Food Science & Technology) documented that sourdough fermentation also degrades FODMAPs, making the bread tolerable for many people who react to commercial bread. What is commonly diagnosed as "gluten intolerance" may in many cases be an intolerance to insufficiently fermented grain.

Fox et al. (2000, Fundamentals of Cheese Science) documented that raw milk cheese retains 67+ active enzymes including lipase, protease, phosphatase and lactoperoxidase, all of which are denatured above 72°C during pasteurisation. These native enzymes continue to hydrolyse proteins and fats during ageing, producing bioactive peptides with ACE-inhibitory (blood pressure lowering), antioxidant and antimicrobial properties.

This is because raw cheese is a fermentation ecosystem, not a static product. Microbial diversity in raw cheese is 10 to 100 fold greater than in pasteurised equivalent (Montel et al., 2014, International Journal of Food Microbiology), with each wheel containing 10^9 to 10^10 CFU per gram of lactic acid bacteria, propionibacteria and surface moulds that continue metabolic activity throughout the ageing process. These organisms produce vitamin K2 MK-7 to MK-10, conjugated linoleic acid and short-chain fatty acids.

Paradoxically, raw cheese has lower pathogen risk than pasteurised soft cheese for products aged over 60 days (FDA data). The competitive exclusion principle means that diverse native microflora outcompete pathogenic species. European countries where raw cheese production is protected (France: 15 per cent of production is raw) have lower dairy-associated infection rates than countries with pasteurisation mandates.

Evenepoel et al. (1998, Journal of Nutrition) fed 25g protein from cooked versus raw eggs to ileostomy patients and measured ileal digestibility: cooked egg protein was 91% absorbed versus 51% for raw. The difference lies almost entirely in avidin and ovomucoid, antinutritional proteins in raw white that are denatured by heat. However, this study measured whole egg, not yolk-specific nutrients.

This is because raw egg yolk contains intact phospholipids, cholesterol sulfate, choline (147mg per yolk), DHA bound to phosphatidylcholine and fat-soluble vitamins A, D, E and K2 in their most bioavailable forms. Cooking above 70°C oxidises cholesterol to oxysterols (Sander et al., 1989, Lipids), denatures the delicate omega-3 phospholipids and reduces vitamin B6 by 20 to 30% (USDA SR Legacy). The yolk is nutritionally superior raw.

Traditional preparations separated this distinction intuitively: European eggnog (raw yolks, cooked whites in hot milk), Japanese tamago-kake-gohan (raw egg on rice), Italian zabaglione (gently warmed yolks). Modern food safety blanket-bans raw eggs despite UK Lion Code eggs having Salmonella prevalence below 0.03% (FSA, 2017). The risk is statistical noise. The nutrient loss from cooking yolks is guaranteed.

Ghee (clarified butter) contains 6 to 8 per cent butyric acid (C4:0) by weight, making it the richest dietary source of this short-chain fatty acid. Butyrate is the primary energy substrate for colonocytes, providing 70 per cent of their metabolic fuel (Roediger, 1982, Gut). Ghee also concentrates fat-soluble vitamins A, D, E and K2, conjugated linoleic acid (CLA) at 5 to 7 mg/g fat and has a smoke point of 250°C, making it chemically stable at high cooking temperatures.

This is because the clarification process removes water, lactose and casein while preserving and concentrating the lipid-soluble nutrients and short-chain fatty acids. Butyrate reaches the colon where it strengthens tight junction proteins (claudin-1, occludin, ZO-1), reduces intestinal permeability, suppresses NF-kB inflammatory signalling and promotes regulatory T-cell differentiation (Furusawa et al., 2013, Nature). Ghee has been used in Ayurvedic medicine for over 5,000 years specifically for digestive repair.

Grassfed ghee contains 3 to 5 times more CLA and vitamin K2 than grain-fed equivalents (Dhiman et al., 1999, Journal of Dairy Science). The removal of casein and lactose makes ghee tolerable for the majority of dairy-sensitive individuals. Despite being 99.8 per cent fat, ghee in moderate amounts (1 to 2 tablespoons per day) has been associated with reduced cardiovascular risk markers in Indian cohort studies (Kumar et al., 2000, Indian Journal of Medical Research).

UK per-capita organ meat consumption fell by ninety-two per cent between 1945 and 2019 according to National Food Survey data, with liver, kidney and heart moving from staple weekly foods to near-total dietary exclusion.

Organ meats are the most nutrient-dense foods in the human diet, containing concentrations of retinol, cobalamin, folate, zinc, iron and CoQ10 that are impossible to replicate through muscle meat alone, let alone from plant sources.

The decline maps directly onto the post-war food culture shift away from whole-animal eating, accelerated by the industrialisation of meat processing and the marketing of manufactured convenience foods to a generation unfamiliar with traditional cooking.

As of March 2026, no published randomised controlled trial has tested a carnivore or exclusively animal-based diet for any clinical outcome in humans. The entire evidence base for this dietary pattern consists of cross-sectional surveys, self-reported improvement data and case reports. The most frequently cited data comes from the Carnivore Diet Survey conducted by Sean Baker (2020), which captured self-reported outcomes from 2,029 respondents, a convenience sample drawn from online communities with no control group.

This is because RCTs of dietary patterns require sustained compliance, large sample sizes and long follow-up periods, all of which are expensive and logistically demanding. The challenge applies equally to other dietary patterns. Mediterranean diet RCTs took decades to accumulate. However, the absence of any trial data matters because animal-based diets are being adopted clinically for autoimmune conditions, mental health disorders and metabolic disease based on mechanistic reasoning and anecdote alone.

For comparison: ketogenic diets now have RCT evidence in type 2 diabetes, epilepsy and (as of February 2026) treatment-resistant depression. Time-restricted eating and fasting have RCT evidence in hypertension, NAFLD, type 2 diabetes and PCOS. Exercise has RCT evidence in all eight major chronic conditions reviewed in the 2025 clinical evidence matrix. Breathwork has small RCT evidence in asthma, IBS and depression. The animal-based diet, despite substantial online adherence and commercial interest, remains entirely untested in a controlled setting.

Metagenomic sequencing studies have identified over two hundred and fifty-six distinct bacterial species in raw milk, representing a diverse living ecosystem that is entirely eliminated by pasteurisation.

The microbial profile of raw milk includes Lactobacillus, Bifidobacterium, Lactococcus and numerous other genera known to colonise the infant gut and support immune maturation. These organisms are absent from commercially pasteurised products.

The pasteurisation process was developed to eliminate specific pathogens including Mycobacterium bovis and Listeria monocytogenes. Its biological cost, the destruction of the entire microbial ecology of the milk, is rarely discussed in the same regulatory conversation.