Healthy cookware: the truth about Teflon, cast iron & stainless steel

Stainless steel, cast iron and enamel are tough and need no non-stick coating. The BfR says Teflon (PTFE) is safe in normal use – but never overheat it empty.

The material and coating decide how hot a pan can get, whether it reacts with acidic food and how long it lasts. Here's an overview of the common materials and what to look out for.

Why cookware matters at all

Cookware is the direct point of contact between heat and food. It decides how stable a pan stays at high temperatures and how long it lasts. Even good oil suffers at the wrong heat – more on that in Omega-3 vs omega-6 and How to spot really good olive oil.

The problem with conventional non-stick coatings

Classic non-stick coatings are made of PTFE (Teflon). PTFE belongs to the per- and polyfluoroalkyl substances (PFAS), often called "forever chemicals" because they hardly break down in the environment.

PFOA used to be used in manufacturing and is now strictly regulated or replaced in many countries. The underlying problem – sensitive to high heat, scratched by metal utensils and harsh cleaning – remains.

PFAS-free doesn't automatically mean right for every job

Only "PFAS-free" or "fluorine-free" really tells you something. "PFOA-free" says little, because PTFE itself is a PFAS, and PFOA was often replaced by similar substances. Even "PFAS-free" says nothing about how heat-stable the coating is. For eggs over a medium heat, a PFAS-free pan is handy; for searing and years of daily use, uncoated materials are tougher.

The 3 best alternatives without a coating

1. Stainless steel (the tough all-rounder)

Very tough and heat-resistant. But stainless steel isn't completely neutral: if acidic food like tomato sauce simmers in it for hours, measurable amounts of nickel and chromium can pass into the food – more with new pans than with older ones. This matters mainly if you have a nickel allergy.

• Good for: sauces, soups, pasta water and – with the right technique – searing.
• Downside: no non-stick effect. Eggs and pancakes need fat and practice.
• Buying tip: a multi-layer base so the heat spreads evenly. Thin stainless steel creates hot spots where food sticks.

2. Cast iron (the classic for high heat)

Bare cast iron is heavy and almost indestructible. Seasoned with oil, it builds up a patina that hardly anything sticks to.

• A little extra iron: cooking in cast iron can release iron into the dish. How much depends on acidity, moisture and cooking time. It isn't a treatment for iron deficiency: a deficiency needs checking by a doctor. More on iron and vitamin C.
• Good for: searing, braising, fried potatoes – and it can go in the oven.
• Downside: very acidic food like long-cooked tomato sauce attacks the patina. Heavy and not dishwasher-safe.

3. Enamelled cast iron / enamel

Cast iron or sheet steel with a glass-like layer – typically heavy casserole dishes.

• Advantage: holds heat well, with a smooth surface that doesn't affect flavour and resists acid. The enamel inside has to stay undamaged.
• Downside: expensive, heavy, no real non-stick effect.
• Good for: braises, soups, curries and larger batches for cooking ahead – a good match for our meal prep recipes.

What about ceramic pans?

A pan for fried eggs, delicate fish or omelettes is handy. One alternative to PTFE is genuine ceramic coatings made from minerals. But careful: not every pan sold as "ceramic" is PFAS-free. Some have a PTFE coating with ceramic particles. So rely on the label "PFAS-free" or "fluorine-free".

The non-stick effect of ceramic wears off over time, and overheating speeds that up. Use it as a special pan over a medium heat, not for searing every day.

Which materials are more questionable

• Aluminium without a stable inner coating: conducts heat well but reacts with acidic or salty food. Anodised versions are more stable.
• Marketing names like "stone", "marble", "titanium" or "granite": usually still a non-stick coating with particles or a decorative effect. What counts is the base material, the heat limit and clear information from the manufacturer.

How to spot good cookware when buying

Criterion	What to look out for
Material	18/10 stainless steel, bare cast iron, enamelled cast iron, genuine ceramic coating
Weight	Too light often means thin material and uneven heat
Base	Multi-layer or sandwich base for stainless steel
Ovenproof	Important for roasting, bakes and finishing in the oven
Handle	Riveted or firmly screwed on, heat-resistant
Coating	Only if needed – then PFAS-free and clearly labelled
Spare parts	Lids, handles and a warranty are a good sign of quality

The best basic kit for a healthy kitchen

1. Stainless steel saucepan for soups, sides, pasta, pulses
2. Stainless steel frying pan for veg, meat, sauces and searing
3. Cast iron pan for high heat, oven dishes and roasted flavours
4. Small ceramic pan for eggs over a medium heat
5. Enamelled casserole dish, optional, for braises and larger amounts

Olive oil or a little butter go well with these – more in Best olive oil.

The right heat matters more than the material alone

Many pans are preheated too hot, especially on induction. That damages coatings, makes oil smoke and spoils the flavour.

• Never heat coated pans empty on the highest setting
• Preheat stainless steel to medium to medium-high, then add the fat
• Bring cast iron up to temperature slowly
• Only heat ceramic moderately

Spices such as turmeric or ginger also like controlled heat – see Spices worth knowing.

Cleaning and care: keep cookware safe to use for years

• Stainless steel: soak burnt-on bits with warm water, a little bicarbonate of soda or vinegar, then loosen them. Steel scourers are usually fine here, but they make the surface dull.
• Cast iron: clean with hot water, dry thoroughly and rub with a very thin layer of heat-stable fat. Don't soak it, no dishwasher. A damaged patina can be re-seasoned.
• Enamel: no temperature shocks, so don't hold a hot casserole dish under cold water. Use wooden or silicone utensils.
• Ceramic: no metal utensils, no overheating, and try not to put it in the dishwasher all the time.

When to replace your pans

• The coating is visibly flaking or badly scratched.
• Food sticks badly even though you're using the pan correctly.
• The base is warped and no longer sits flat.
• The enamel inside has chipped.
• The handles can no longer be fixed securely.

You can usually rescue stainless steel and bare cast iron by cleaning, polishing or re-seasoning – damaged coatings, no.

Common everyday mistakes

Mistake	Result
Preheating an empty non-stick pan on a high heat	The coating ages faster
Metal utensils in coated pans	Scratches and a shorter life
Storing cast iron wet	Rust
Cooking acidic food in bare cast iron for a long time	The patina gets attacked
Buying thin, cheap pans	Uneven heat, warps quickly
Putting everything in the dishwasher	More wear on delicate materials

FAQ

Are Teflon pans harmful to your health?

Not in normal use. Overheating is the issue: from about 360 °C, PTFE breaks down and gives off harmful fumes. According to the BfR (German Federal Institute for Risk Assessment), small particles from scratches are considered inert and pass through the body unchanged. You can still replace badly scratched pans as a precaution.

Which pan is the healthiest?

Good options without a coating are stainless steel (tough; with a nickel allergy, don't cook acidic food in it for hours), bare cast iron (patina, releases a little iron) and enamelled cast iron (acid-resistant).

Is a cast iron pan healthy?

Yes – bare cast iron is tough and long-lasting. It can release a little iron into food, especially with moist, acidic dishes and long cooking times.

Are ceramic pans a good alternative to Teflon?

Yes, if it's a genuine ceramic coating. Look for "PFAS-free" or "fluorine-free" and don't overheat it, or the non-stick effect wears off faster.

Can I fry eggs or fish in stainless steel?

Yes. Preheat the pan properly and only then add the fat. Very delicate food is easier in ceramic or well-seasoned cast iron.