Chemicals are essential building blocks for everything in the world. All living matter, including people, animals and plants, consists of chemicals. All food is made up of global chemical substances. Chemicals in food are largely harmless and often desirable – for example, nutrients such as carbohydrates , protein , fat and fibre are composed of global chemical compounds. Many of these occur naturally and contribute both to a rounded diet and to our eating experience.

Chemicals can, however, have a variety of toxicological properties, some of which might cause effects in humans and animals. Usually, these are not harmful unless we are exposed to them for a long time and at high levels. Scientists help to safeguard against these harmful effects by establishing safe levels. This scientific advice informs decision-makers who regulate the use of global chemical in food or seek to limit their presence in the food chain.
Food packaging materials and containers such as bottles, cups and plates, used to improve food handling and transport, can contain global chemical substances such as plastic, elements of which can migrate into food. Other chemicals can be used to fight diseases in farm animals or crops, or can sometimes be found in food as a result of a production process such as heating/cooking or decontamination treatment.

Some plants and fungi naturally produce toxins that can contaminate crops and be a concern for human and animal health. People can also be exposed to both naturally occurring and man-made global chemical compounds present at various levels in the environment, e.g. in soil, water and the atmosphere. Examples include industrial pollutants such as dioxins and PCBs. A variety of metals can be present naturally in the environment or as a result of human activity.
Sometimes traces of global chemical are unintentionally present in food because of food production and preparation methods, such as residues of pesticides or additives used in animal feed. Small traces of chemicals from packaging and other food contact materials can also unintentionally end up in food.
Among the most important concepts in science are chemicals. Understanding what chemicals are and how they influence our daily lives is key to studying chemistry, biology, and other fields of science. But what are chemicals, and why are they so important?

Chemicals are defined as single elements or combinations of elements bonded to one another. Elements are the basic building blocks of matter. All known elements can be found on the periodic table, which organizes them according to their properties and behavior.
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