By Nur Nadhirah Mohamad Zain
Modern life moves quickly, and plastic has quietly become one of our constant companions. From mineral water bottles and takeaway food containers to coffee cups and frozen food packaging, plastic is everywhere. It is light, cheap, practical, and convenient, which makes it difficult to avoid in daily life.
Yet behind this convenience lies a question many of us rarely stop to ask: are all plastics truly safe for food?
This is not a new issue. Health authorities and researchers have long warned about the risks associated with certain plastics used in food packaging. Despite this, public awareness remains uneven. Some risks continue to be overlooked simply because the effects are not immediately visible.
One example that still occurs today is the practice of heating cooking oil together with its thin plastic packaging. In such situations, the plastic is exposed to high temperatures and may release chemicals into the oil. Physically, the oil may still look normal and safe to use, but chemical contamination can still occur. The concern becomes even greater when that oil is later used to prepare hot food for customers.
In recent years, scientists and health experts have paid increasing attention to chemicals commonly associated with plastics, particularly phthalates and Bisphenol A, more widely known as BPA.
Phthalates are chemicals used to make plastics softer, more flexible, and more durable. They are commonly found in various plastic products, including some forms of food packaging. BPA, meanwhile, is used in hard and transparent plastics such as certain water bottles, food storage containers, and the inner lining of food and beverage cans.
These substances are not “instant poisons” that immediately cause harm the moment plastic is used. In fact, they play useful roles in manufacturing. The problem arises when consumers are unaware of how plastics should be properly used, leading to careless practices in everyday life. What concerns scientists is the ability of these chemicals to migrate from packaging into food through a process known as chemical migration.
Chemical migration occurs when substances from packaging materials transfer into food that comes into contact with them. The transfer may happen in very small amounts, but the risk increases depending on how the plastic is used.
Certain everyday habits can increase the likelihood of phthalates and BPA entering food. These include pouring hot food or drinks directly into plastic containers, heating food in plastic containers inside microwave ovens, storing oily or fatty foods in plastic packaging, and repeatedly using containers that are already damaged or warped.
In simple terms, the higher the temperature, the longer the storage period, and the oilier the food, the greater the potential for chemicals to migrate into what we eat.
One common misconception is that a plastic container is safe as long as it still looks clean. Many consumers continue using old plastic containers for food storage simply because they appear intact. In reality, not all plastics are designed to withstand high heat or repeated reheating.
This misunderstanding is deeply embedded in daily routines. People pour hot soup or curry into thin plastic containers without a second thought. Others reheat meals in containers that were never meant for microwave use, often without checking whether the packaging carries a microwave-safe label.
These actions may seem trivial, but repeated exposure over many years could gradually increase contact with chemicals that do not belong in food.
International studies have linked prolonged exposure to phthalates and BPA with hormone disruption, reproductive system effects, and other potential health risks. Although daily exposure levels are often low, consistently reducing unnecessary exposure remains an important preventive step.
Still, discussions about these chemicals should not be seen as an attempt to frighten consumers or encourage people to abandon plastic altogether. Plastic remains an important part of modern life. The real goal is awareness. Consumers should understand that convenience also comes with responsibility, especially when it involves food safety.
A few simple habits can help reduce the risks associated with chemical migration. Hot food should not be poured directly into thin or questionable plastic containers. Glass, ceramic, or stainless steel containers are safer choices for hot meals. Consumers should look for labels such as “food grade” or “microwave safe” before using plastic containers for heating. Reducing the use of single-use plastics where possible is also a sensible step. Even something as simple as avoiding prolonged exposure of plastic bottles to heat inside parked cars or under direct sunlight can make a difference.
These may seem like small adjustments, but over time, small habits shape long-term health outcomes.
Health is influenced not only by what we eat, but also by how food is stored, heated, and packaged. Choosing the right food container may appear insignificant, yet such decisions can quietly affect our wellbeing over the years.
Being a wise consumer does not mean rejecting modern technology or convenience. Plastic undoubtedly makes life easier. But informed consumers understand that not every convenience should be accepted without thought.
Assoc. Prof. Ts. ChM. Dr Nur Nadhirah Mohamad Zain is from the Department of Toxicology, Pusat Kanser Tun Abdullah Ahmad Badawi (PKTAAB), Universiti Sains Malaysia (USM)
About The Author
