Is Aluminium Foil Safe for Cooking?

Yes. Aluminium foil and foil containers are considered safe for cooking, baking, freezing and storing food when they are used as intended. Food contact packaging in the UK must meet strict legal requirements, and food safety authorities have found no evidence that normal use of aluminium foil harms health. Very small amounts of aluminium can move into food, mainly when highly acidic or salty foods are cooked or stored in uncoated foil for long periods. For those foods, choosing a lacquered tray or a different container keeps that transfer to a minimum.

This guide explains what the evidence says, when to take extra care and how food businesses can make sure their foil packaging is compliant.

How aluminium foil works with food

Aluminium naturally forms a thin, stable layer of aluminium oxide on its surface. This layer acts as a barrier between the metal and the food, which is one reason aluminium has been used safely for food packaging and cookware for decades. It also makes foil an effective barrier to light, oxygen and moisture, protecting food quality. Our article on the role of aluminium in food packaging covers these properties in more detail.

Does aluminium get into food?

Small amounts can, but in most cases the quantities are very low. Aluminium is one of the most common elements on earth, and it is naturally present in many foods and in drinking water. For most people, food itself is by far the largest source of aluminium in the diet, rather than packaging or cookware.

The amount that moves from foil into food depends on a few factors:

• Acidity: highly acidic foods such as tomatoes, rhubarb, citrus fruits and vinegar-based marinades can weaken the oxide layer.
• Salt: very salty foods and brines can have a similar effect.
• Time: storing these foods in uncoated foil for long periods increases contact time.
• Temperature: higher cooking temperatures can increase transfer when combined with acidic or salty foods.

The European Food Safety Authority (EFSA) has set a tolerable weekly intake for aluminium of 1mg per kilogram of body weight. Normal use of foil containers contributes only a small part of total dietary intake for most people.

What about aluminium and Alzheimer’s disease?

Concerns about a link between aluminium and Alzheimer’s disease date back several decades. Since then, research has not established that aluminium from cookware, foil or food packaging causes dementia. UK dementia charities, including the Alzheimer’s Society and Alzheimer’s Research UK, state that there is no convincing evidence that everyday exposure to aluminium through cooking or packaging increases the risk of developing Alzheimer’s disease.

People with reduced kidney function clear aluminium from the body less effectively, so anyone with a medical condition should follow the advice of their doctor or dietitian.

When to take extra care with foil

Following a few simple rules keeps aluminium transfer to a minimum:

• Avoid storing very acidic or very salty foods in uncoated foil for long periods, particularly once cooked.
• For acidic dishes such as tomato-based sauces, fruit compotes or pickled foods, use a tray with an internal lacquer coating.
• Cover acidic dishes with a card or film lid rather than wrapping foil directly against the food surface.
• Transfer leftovers to a suitable container if they will be kept for several days.

Lacquered foil trays for acidic foods

Food manufacturers and caterers can avoid the issue altogether by specifying the right tray. As a guide, plain uncoated foil is suitable for foods with a pH between about 4.5 and 6.0. Foods outside that range should be packed in trays with an internal lacquer, a food-safe coating that separates the food from the aluminium and prevents corrosion. Lacquered trays are commonly used for ready meals with tomato or fruit-based sauces. Our FAQs cover lacquer options and minimum order quantities, and our smoothwall foil trays are widely used for sealed retail ready meals.

Food contact compliance: what the law requires

In the UK, all materials that come into contact with food must comply with food contact legislation, which is based on Regulation (EC) No 1935/2004. In simple terms, packaging must not transfer substances to food in quantities that could harm health, change the food’s composition in an unacceptable way or affect its taste and smell. Manufacturers must also follow good manufacturing practice and maintain traceability.

For food businesses, the key is to buy from a supplier that can evidence compliance. At Sai Alupack, our foil containers are supplied with a statement of compliance for food contact use, and our production is managed under our quality and food safety policy. Our site is also BRCGS certified.

Using foil containers safely: quick checklist

1. Buy from a supplier that provides food contact compliance documentation.
2. Choose lacquered trays for highly acidic or salty foods.
3. Follow cooking instructions, and remove any non-foil lids before heating.
4. Support trays when moving them hot, to avoid spills and burns.
5. Do not reuse damaged or heavily scratched trays for acidic foods.

For practical advice on cooking and baking in foil, see our guide to baking in foil trays.

Frequently asked questions

Is aluminium foil safe for cooking?

Yes. Aluminium foil and foil containers are considered safe for cooking when used as intended. Take extra care with highly acidic or salty foods, which are best cooked or stored in lacquered trays.

Does cooking in aluminium foil cause Alzheimer’s?

There is no convincing evidence that cooking with aluminium foil causes Alzheimer’s disease. UK dementia charities do not consider everyday aluminium exposure a proven risk factor.

Can you put tomato-based food in foil trays?

Yes, for cooking and short-term storage. For ready meals or longer storage of tomato-based dishes, a tray with an internal lacquer is the better choice.

Are aluminium food containers safe?

Yes. Aluminium food containers made for food contact must comply with UK food contact law. Ask your supplier for a statement of compliance.

Food-safe foil packaging from a certified manufacturer

Aluminium foil remains one of the most practical and widely used food packaging materials. To discuss the right tray, coating or documentation for your products, contact our team.