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Ingredient Quality Standards

The meal is only as good as what goes into it.

Most private chefs start at the recipe. We start two steps earlier, at how the ingredient was grown, how fresh it reaches your kitchen, and what we refuse to bring into it.

A BioChef preparing ingredients.
BioChef · London, W1
A century of change

Today’s produce isn’t the same as your great-grandparents’.

A century ago, food was simply food. Grown nearby, eaten in season and cooked from raw. Nutrition was the default option.

As we developed and found new ways to store food, refrigeration, then long-haul logistics, crops were bred for yield, size and shelf-life. Distribution went national, then global. A carrot grown in 1950 and one grown today are not nutritionally the same vegetable. Today, many crops show measurable decline in nutrients such as iron, calcium and vitamin C[1].

Now most of what fills a supermarket is ultra-processed, produce is bred to survive transport, and “fresh” vegetables are often days old before they’re cooked. Spinach can lose roughly a third of its vitamin C within 24 hours of being cut[2].

USDA reanalysis, 1950 → 1999

Measurable decline

in iron, calcium and vitamin C across 43 garden crops.

Davis et al. · ref. [1]
Post-harvest storage

~1/3 of vitamin C

lost from spinach within 24 hours of being cut.

PMC review · ref. [2]
Why ingredient quality matters

It’s not just about what you eat. It’s about what your food eats as well.

How plants are affected by soil.

A plant is built from what it can pull out of the ground. Biologically healthy soil produces crops denser in minerals and higher in polyphenols, the compounds plants make to defend themselves[3]. Depleted soil and crops bred for yield give you the opposite.

How animals are affected by what they eat.

An animal’s food becomes your food. Cattle on pasture, hens with genuine range, fish from the wild, eating what their biology evolved for, show better nutrition in fat and vitamins[5][8]. Grain-fed, confined animals produce a measurably different product.

What that actually changes

Mineral density[1]

Iron, zinc, magnesium, calcium and iodine.

Polyphenols[4]

The plant’s own defence compounds; higher in well-grown and organic crops.

Fat quality[5]

More omega-3 and CLA, a lower omega-6:3 ratio in pasture-raised vs grain-fed.

Fat-soluble vitamins[6]

Vitamin K2 and A in grass-fed dairy and meat; more in pasture-raised eggs.

Contaminant load[7]

Fewer pesticide residues, less cadmium in organic; less mercury in small wild fish.

Flavour

Ripeness, variety and freshness you can taste.

What this does is straightforward. It lowers what burdens the body, fewer pesticide residues, less cadmium and mercury, none of the ultra-processed food now linked to higher rates of heart disease and early death[9]. And it raises what protects it, the fibre, omega-3s and plant compounds most people don’t get enough of[10].

The framework

The Modern Ancestral Diet.

The Modern Ancestral Diet is the spine of every plate your BioChef makes, from longevity protocols to clinical plans to pure performance.

01

Whole foods

Nothing ultra-processed. Real ingredients, made in your kitchen.

02

Nose-to-tail

Prime cuts, offal and broths for dense nutrition.

03

Seasonal & local

Food at its nutrient peak, not flown in to fill a menu.

04

Organic

Organic, regenerative or biodynamic — grown without the chemical load.

05

Prepared for digestion

Soaked, fermented and sprouted to cut anti-nutrients and feed the gut.

06

Diversity[11]

A wide range of plants and animals to nourish the microbiome.

07

Natural fats

Olive oil, ghee, tallow. Not industrial seed oils.

08

Rhythm over rigidity

Eating that moves with you and the seasons, not a fixed template.

One framework. Works with virtually any goal, longevity, performance, or a clinical protocol.

What we use and avoid

What’s in. What’s out.

Two short lists. Everything your BioChef sources sits on the left. Everything they won’t put in your food sits on the right.

In

What we cook with.

  • Organic fruits & vegetables, seasonal, local where possible.
  • Grass-fed & pasture-raised meat, organs and eggs.
  • Wild fish.
  • Ferments, kefir, sauerkraut, miso.
  • Bone broth, sprouted grains, soaked legumes.
  • Natural fats, organic extra-virgin olive oil, ghee, tallow.
  • Herbs & spices.
  • Unrefined sea salt.
  • Filtered water.
Out

What we don’t.

  • Ultra-processed food.
  • Industrial seed oils, rapeseed, soy, sunflower.
  • Refined sugar, flour and grains.
  • Factory-farmed meat & eggs.
  • Artificial sweeteners, colours, preservatives.
  • Margarine.
  • Anything we wouldn’t feed our own families.

Supplement and protein powders only if they’re clean with minimal ingredients (nothing added).

Where your food comes from

Where do BioChefs shop?

Our BioChefs work to a sourcing standard with a list of recommended suppliers. Suppliers vary by region, you may be in New York, London, or somewhere else entirely.

Generally, chefs shop from a mixture of green-grocers, butchers, fisheries, online health shops and organic supermarkets. You get the receipts to see where your BioChef bought your ingredients.

BioChefs will also use whole-food suppliers for pre-made foods, fermented foods, broths and the like, when they come from trusted sources and make sense. These foods can take days to make; it saves your chef from setting up a laboratory in your kitchen, and is more cost-effective for you.

Specialty foods

Your BioChef sources heritage and specialty foods.

01 · Specialty

Cold-pressed estate olive oil, chosen for its polyphenols.[12]

02 · Specialty

Wild meats reared on their natural evolutionary diet.

03 · Specialty

Specialty cheeses, including unpasteurised, from their source of origin.

04 · Specialty

Spices and herbs selected for polyphenol content — cocoa, turmeric, mushroom powders.[13][14]

05 · Specialty

Activated and sprouted grains and seeds, unlocking nutrients and removing plant defence compounds.

06 · Specialty

Bone broths and fermented foods for gut health and microbiome diversity.[11]

Non-toxic cooking

What your ingredients are cooked and stored in.

It’s not just about the ingredients. It’s also what they touch on the way to the plate. We work to non-toxic cooking principles.

Cookware

Stainless steel, carbon steel and cast iron. No non-stick coatings, no aluminium for acidic foods.

Storage

Glass, not plastic — reducing microplastic load.[15]

Water

Filtered or reverse-osmosis for cooking and washing produce.

Personalised menus

Your menus are designed around your body.

The Modern Ancestral Diet is the framework we use for ingredient sourcing. Your BioChef builds your menus around your body, your goals, intolerances, biomarker data, and your practitioner’s plan.

Same framework, different plate, every time.

Set and forget your diet.

Your BioChef handles the sourcing, the menus, the cooking, the cleaning.

Find My BioChef →
References

Sources

Reviewed May 2026

  1. Davis DR, Epp MD, Riordan HD. Changes in USDA food composition data for 43 garden crops, 1950 to 1999. J Am Coll Nutr, 2004. (Coverage: Scientific American, “Dirt Poor.”)https://www.scientificamerican.com/article/soil-depletion-and-nutrition-loss/
  2. Novel insights into ascorbate retention and degradation during the washing and post-harvest storage of spinach and other salad leaves. PMC.https://pmc.ncbi.nlm.nih.gov/articles/PMC5441274/
  3. From Fighting Critters to Saving Lives: Polyphenols in Plant Defense and Human Health. PMC.https://pmc.ncbi.nlm.nih.gov/articles/PMC8396434/
  4. Barański M, et al. Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: a systematic literature review and meta-analyses. British Journal of Nutrition, 2014.https://pmc.ncbi.nlm.nih.gov/articles/PMC4141693/
  5. Daley CA, et al. A review of fatty acid profiles and antioxidant content in grass-fed and grain-fed beef. PMC.https://pmc.ncbi.nlm.nih.gov/articles/PMC2846864/
  6. Penn State. Research shows eggs from pastured chickens may be more nutritious.https://www.psu.edu/news/agricultural-sciences/story/research-shows-eggs-pastured-chickens-may-be-more-nutritious
  7. Sandri (Stirling). Wild fish consumption can balance nutrient retention in farmed fish. Nature Food, 2024.https://www.nature.com/articles/s43016-024-00932-z
  8. Lane MM, et al. Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses. BMJ, 2024.https://pmc.ncbi.nlm.nih.gov/articles/PMC10899807/
  9. Reynolds A, et al. Carbohydrate quality and human health (dietary fibre & whole grains). The Lancet, 2019.https://www.thelancet.com/article/S0140-6736(18)31809-9/fulltext
  10. Wastyk HC, et al. Gut-microbiota-targeted diets modulate human immune status (fermented foods). Cell, 2021.https://www.cell.com/cell/fulltext/S0092-8674(21)00754-6
  11. Exploring the Cardiovascular Benefits of Extra Virgin Olive Oil (EVOO polyphenols; PREDIMED). PMC.https://pmc.ncbi.nlm.nih.gov/articles/PMC11852600/
  12. Pérez-Jiménez J, et al. Identification of the 100 richest dietary sources of polyphenols (Phenol-Explorer). Eur J Clin Nutr, 2010.https://pubmed.ncbi.nlm.nih.gov/21045839/
  13. Sesso HD, et al. Cocoa flavanol supplementation for the prevention of cardiovascular disease events: the COSMOS randomized clinical trial. Am J Clin Nutr, 2022.https://ajcn.nutrition.org/article/S0002-9165(22)00275-1/fulltext
  14. Detection of microplastics in human tissues and organs: a scoping review. J Glob Health / PMC, 2024.https://pmc.ncbi.nlm.nih.gov/articles/PMC11342020/