Stainless Steel

Stainless steel is an iron-based alloy with chromium (the "stainless" part — chromium forms a thin protective oxide layer that resists rust) and usually nickel for strength and corrosion resistance. The most common food-grade types are 304 (also called 18/8 — 18% chromium, 8% nickel) and 316 (which also includes molybdenum for extra corrosion resistance).

Durable, non-reactive with most foods, easy to clean, handles heat well, doesn't break, lasts for decades. It's the workhorse of professional kitchens, hospitals, and food processing — and increasingly the go-to alternative to plastic for water bottles and food containers.

Stainless steel, food-grade stainless steel, 18/8 steel, 304 steel, 316 steel, inox (European term), surgical steel (a marketing term, usually means 316). The grade number is what matters — 304 and 316 are food-grade; lower grades may not be.

Reusable water bottles, travel mugs, cookware (saucepans, frying pans), cutlery, bowls, baby utensils, sinks, appliances, scouring pads, and many tools. It's everywhere — the question is usually whether a specific item is food-grade.

Tiny amounts of nickel and chromium can migrate into food, especially with very acidic foods (tomato sauce, vinegar) cooked for long periods. For most people, this is well below any meaningful exposure threshold. Nickel-sensitive individuals (some people with contact dermatitis to nickel jewelry) may notice it.

Stainless steel is widely recommended as a safe pregnancy-era replacement for plastic food storage. Nickel migration is minimal at typical use and not a documented pregnancy concern.

No documented concerns.

Stainless steel baby utensils and cups are excellent alternatives to plastic. Some metal sippy cups and lunch boxes are now widely available. No specific concerns for kids.

No specific signal. Some older adults find heavy stainless cookware harder to lift than aluminium alternatives — that's the only practical consideration.

Stainless steel is one of the most-studied food-contact metals. Migration of nickel and chromium is well-characterised; for most people at typical exposure, it's well below health-based limits. Some research notes that older or damaged cookware migrates slightly more, and prolonged acidic-food contact (slow-cooked tomato sauce) is the worst case — but even that stays low.

Very low. The reason stainless steel is broadly recommended as a plastic alternative is that the cost-benefit is strongly favourable — meaningful reduction in plastic exposure, minimal metal exposure.

For most uses, stainless steel itself is one of the safer options. For nickel-sensitive individuals or for prolonged acidic-food contact, glass or ceramic are alternatives. Cast iron for cookware (adds iron, which most people need anyway). Don't downgrade to plastic to avoid theoretical nickel exposure.

Easy to choose — stainless steel options are widely available for almost every food-contact use. The harder part is checking that an item is actually food-grade (304 or 316), since cheaper alternatives sometimes use lower grades.

If you still use plastic for daily water bottles or hot drinks at work, switch to a stainless steel bottle or insulated tumbler. One-time purchase, lasts years, immediately reduces a high-frequency plastic-and-heat exposure.

Stainless steel is one of the easier wins. Use it freely for water bottles, food storage, and cookware. The only nuance is grade (304 or 316 for food contact) and being mindful of nickel-sensitivity if you have it.

FDA food-contact materials, EU food-contact framework, and metal migration studies in PMC. See References below.