The Health Puzzle

A bright yellow spice from the root of the Curcuma longa plant, widely used in cooking and traditional medicine, with curcumin being its primary active compound. Curcumin has well-documented anti-inflammatory and antioxidant properties, though it is poorly absorbed without black pepper (piperine) or a fat source.

A fermented vinegar made from crushed apples, containing acetic acid and, in unfiltered forms, a colony of beneficial bacteria known as “the mother.” It has traditionally been used to support digestion and blood sugar regulation, and is a safe, natural ingredient for cooking and food preparation.

An emulsifier extracted from sunflower seeds, used in supplements, chocolate, baked goods, and non-stick cooking sprays, and often recommended as a cleaner alternative to soy lecithin. While it is free from common allergens and GMO concerns, lecithin is rich in unsaturated fatty acids and prone to oxidation and rancidity, particularly in supplement or liquid form if poorly stored.

A polysaccharide produced by bacterial fermentation, used as a thickener and stabiliser in sauces, dressings, gluten-free baking, and personal care products. It is generally well tolerated in small amounts, but those with IBS, IBD or allergies to corn, soy or wheat should be cautious. Those following a gluten-free diet may consume significantly more than average, which research suggests could alter the gut microbiome in ways not yet fully understood.

A naturally occurring organic acid found in citrus fruits, used as a flavour enhancer and preservative in foods and drinks. While naturally sourced citric acid is well tolerated, most commercial citric acid is produced by fermenting corn using Aspergillus niger mould rather than extracted from citrus—people with mould sensitivities may react to the manufactured form.

A naturally occurring acid found in citrus fruits, used as an effective household descaler for kettles, shower heads, taps and washing machines. It is non-toxic, biodegradable and a safe alternative to commercial limescale removers.

A zero-calorie sweetener derived from the leaves of the Stevia rebaudiana plant, available as whole leaf, liquid extract or highly processed powder (often blended with erythritol or maltodextrin). While stevia does not raise blood sugar, research on its effects on the gut microbiome is mixed, animal studies have raised concerns about metabolic effects in offspring during pregnancy, and most commercial stevia products are far removed from the minimally processed whole leaf form.

A rock salt mined from the Khewra Salt Mine in Pakistan, with its pink colour coming from trace iron oxide and over 80 other trace minerals. It is unrefined and free from additives, though the trace minerals include tiny amounts of heavy metals. Choose a reputable brand that provides third-party purity testing to ensure the cleanest product.

Salt made by evaporating seawater retains trace minerals like magnesium, potassium, and calcium—nutrients often removed during the refining of standard table salt. It is minimally processed and typically free from anti-caking agents. However, studies have found that sea salts worldwide can contain microplastics, so it’s best to choose a reputable brand that tests for contaminants.

Per- and polyfluoroalkyl substances, a family of thousands of synthetic chemicals used in non-stick coatings, waterproof textiles, food packaging, firefighting foams, and stain-resistant treatments. Known as “forever chemicals” because they persist indefinitely in the environment and accumulate in the body. PFAS are linked to cancer, immune dysfunction, hormonal disruption, and liver damage.

Perfluorooctanoic acid, a synthetic chemical historically used in the manufacture of Teflon and other non-stick and stain-resistant products. PFOA is a persistent “forever chemical” that does not break down in the environment or the body, with exposure linked to kidney and testicular cancer, thyroid disease, immune suppression and reproductive harm.

Polytetrafluoroethylene, a synthetic fluoropolymer used as a non-stick coating on cookware, bakeware, and some food-processing equipment. PTFE is a PFAS (forever chemical) compound that can release toxic fumes when overheated above 260°C, and its production has historically involved PFOA, a persistent environmental pollutant linked to cancer and immune suppression.

A sol-gel coating marketed as a safer alternative to Teflon, used on non-stick frying pans and bakeware, is typically applied over an aluminium base. Despite being PFAS-free, these proprietary coatings contain undisclosed nanoparticles—including titanium dioxide, which has been detected migrating into food during normal use. Once the coating wears or scratches, the aluminium beneath is exposed, with manufacturers offering little transparency about what is in their formulations.

Aluminium that has been electrochemically treated to create a hard, sealed oxide layer, commonly used in cookware and bakeware. The anodised surface significantly reduces aluminium leaching compared to untreated aluminium, but it degrades over time, particularly with acidic foods, abrasive cleaning or scratching. Once the protective layer is compromised, the underlying aluminium is exposed, with all the associated health concerns.

A natural wax produced by honeybees, used in candles, food wraps, lip care, skincare balms, wood finishes and furniture polish. It is non-toxic, hypoallergenic and burns cleanly without releasing harmful chemicals, making it a safe alternative to paraffin wax and synthetic sealants.

A glass-like coating fired onto pottery, stoneware and ceramic cookware to create a smooth, non-porous surface. When certified free from lead and cadmium, ceramic glazes are chemically stable and safe for food and drink contact.

A glass-based coating fused to metal or ceramic at high temperature, used on cookware, baking dishes and cast iron. When certified lead- and cadmium-free and in good condition, enamel is non-reactive and creates a safe cooking surface. However, chipped or cracked enamel should be replaced, as it can expose the metal beneath to food and shed sharp glass-like fragments, and vintage or budget enamelware may contain lead or cadmium in the glaze.

A stainless steel grade containing 18% chromium and 10% nickel, commonly found in quality kitchen cookware and cutlery. It is essentially the same composition as 304 stainless steel and shares the same acidic food leaching concerns; safe for general cooking and non-acidic foods, but nickel and chromium can leach into acidic dishes during prolonged cooking or storage.

A widely used food-grade stainless steel alloy found in cookware, cutlery, sinks, and water bottles is safe for everyday use with non-acidic foods and drinks. However, peer-reviewed research shows it can leach nickel and chromium into acidic foods, such as tomato sauce and citrus juice, particularly with prolonged cooking or storage. Those with nickel sensitivity or concerns about acidic food contact may prefer 316 stainless steel or glass.

A heavy, durable iron alloy used in cookware for centuries, prized for its excellent heat retention and even cooking. When properly seasoned with oil, it creates a natural, chemical-free non-stick surface that improves with use and may contribute small amounts of dietary iron—an essential mineral, though those with haemochromatosis (iron overload) should limit use.

A hard, lightweight plastic resin used in children’s plates, picnic tableware and kitchen worktop laminates. Melamine can leach formaldehyde and melamine compounds into food when exposed to heat or acidic foods, with chronic exposure linked to kidney damage.

A hard, clear plastic historically used in baby bottles, water cooler bottles, and food containers, typically manufactured using BPA. Even products labelled #7 that are BPA-free may contain other bisphenol compounds with similar endocrine-disrupting properties.

A petroleum-based plastic used in takeaway containers, disposable cups, packaging foam, and some food trays. Styrene, its chemical building block, is classified as a possible human carcinogen and can leach into hot, fatty or acidic foods.

Polyvinyl chloride, a rigid or flexible plastic used in pipes, cling film, vinyl flooring, toys and shower curtains. PVC requires phthalate plasticisers to become flexible and releases dioxins during production and incineration, making it one of the most environmentally and health-damaging plastics.

A group of chemicals used to soften plastics and as solvents in personal care products, found in PVC, vinyl flooring, food packaging, toys and fragranced products. Phthalates are endocrine disruptors linked to reproductive harm, reduced fertility, developmental problems in children and increased risk of asthma. See also: Personal Care & Cosmetic Ingredients.

BPA substitute used in some plastics, coatings and food contact materials. It has been shown to exhibit oestrogenic and anti-androgenic activity, raising concerns that “BPA-free” products containing BPF may carry similar health risks.

A chemical used as a replacement for BPA in products marketed as “BPA-free,” found in till receipts, food containers and some plastics. Research suggests BPS has similar endocrine-disrupting properties to BPA, with comparable effects on hormonal signalling and cell function.

An industrial chemical used to make polycarbonate plastics and epoxy resins, found in some water bottles, food can linings, till receipts and plastic containers. BPA is a well-documented endocrine disruptor that mimics oestrogen, with research linking it to reproductive disorders, metabolic dysfunction, cardiovascular disease, and developmental issues in children.

A synthetic polymer used in cooking utensils, tea bags, oven bags and some food processing equipment. It is heat-resistant and generally stable, but some studies suggest it may release small amounts of caprolactam when heated, and nylon tea bags can shed microplastics into hot water.

A lightweight plastic used in single-use water and soft drink bottles, food trays and some packaging. While considered safe for single use at room temperature, PET can leach antimony and other compounds when exposed to heat, sunlight or prolonged storage, and a 2024 study found an average of 240,000 micro and nanoplastic particles per litre of bottled water—so reuse and heating are best avoided.

A BPA-free co-polyester plastic developed by Eastman, commonly used in reusable water bottles, baby bottles, and food storage containers. Eastman-funded studies found no oestrogenic or androgenic activity, but some independent research has detected oestrogenic leaching, leaving a degree of scientific uncertainty—it is likely safer than polycarbonate but may not be entirely inert.

A low-density polyethylene plastic used in bread bags, squeeze bottles, cling film alternatives, and bin liners. It is one of the lower-risk plastics in terms of chemical leaching, but it still sheds microplastic particles, particularly when exposed to heat or UV light. Studies have identified LDPE among the most common microplastic polymers found in drinking water, food, and the human body.

A high-density polyethylene plastic used in milk bottles, chopping boards, water pipes, and some food storage containers. It is chemically stable and free from BPA, but like all plastics, it breaks down into microplastics. Some HDPE food containers have tested positive for PFAS contamination, and the long-term health effects of microplastic ingestion, now found in human blood, placentas and brain tissue, are still being understood.

A lightweight, heat-resistant plastic widely used in food containers, yoghurt pots, bottle caps and microwave-safe dishes. While it does not contain BPA or phthalates, research has shown that PP releases microplastic particles into food and drink, particularly when heated. Emerging evidence links PP microplastics to gut inflammation and cellular damage.

A synthetic rubber made from silicon, oxygen, carbon and hydrogen, used in bakeware, spatulas, baby bottle teats and food storage bags. It does not contain BPA or phthalates and is generally considered inert, though some research suggests it may release small amounts of siloxanes at high temperatures—and unlike glass or steel, its long-term safety profile is less well established.

A liquid heavy metal found in some thermometers, dental amalgam fillings, certain fish and industrial pollution. Mercury is a potent neurotoxin that can cross the blood-brain barrier and the placenta, with chronic exposure linked to cognitive impairment, tremors and kidney damage.

A toxic heavy metal found in some batteries, pigments, cigarette smoke and contaminated soils, which can enter the food chain through crops grown in polluted land. Cadmium is classified as a Group 1 carcinogen and accumulates in the kidneys and bones, with a biological half-life of 10–30 years.

A soft, heavy metal historically used in paint, plumbing, ceramics and petrol, now recognised as toxic at any level of exposure. Lead accumulates in bones and organs, causing neurological damage, developmental delays in children, kidney disease and cardiovascular problems.

A silvery metal used in alloys, plating, jewellery and some stainless steel grades, and one of the most common contact allergens. Prolonged skin contact can cause dermatitis, and certain nickel compounds are classified as carcinogenic to humans by the International Agency for Research on Cancer.

A lightweight metal widely used in cookware, foil, antiperspirant deodorants, antacids and food packaging. Aluminium has no known biological function and can accumulate in the brain, bones and liver with chronic exposure, with research linking it to neurotoxicity, Alzheimer’s disease and oestrogen-mimicking activity.

A copper-zinc alloy used in taps, fittings, doorknobs and some decorative cookware. Older or lower-quality brass may contain lead, and the copper content can leach into water or acidic foods, so it is best avoided for direct food contact unless certified lead-free.

An essential mineral found in galvanised coatings, supplements and some alloys, playing a vital role in immune function and wound healing. However, excessive intake from supplements or prolonged cooking in zinc-coated vessels can cause toxicity, nausea and copper depletion.

An essential trace mineral used in cookware, water pipes, supplements and some alloys, valued for its natural antimicrobial properties. While small amounts are needed by the body, copper can leach into drinking water from household plumbing and unlined copper cookware can leach excessive amounts into acidic or salty foods, potentially causing nausea and liver damage over time.

A precious metal that is chemically inert in its pure form, used in dental work, medical implants, food decoration and jewellery. Its stability means it does not corrode, leach or interact with the body in any harmful way.

A lightweight, exceptionally strong metal used in medical implants, high-end cookware and water bottles. It is biocompatible, corrosion-resistant and does not leach into food or react with body tissues.

A higher-grade stainless steel alloy containing molybdenum, used in surgical instruments, marine hardware and premium cookware. Its superior corrosion resistance makes it one of the safest metals for food and body contact.