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Chemicals, in processed foods
All food is made of chemicals - so the title of this entry might be misleading. Natural orange juice, for example, is made up of more than a hundred natural chemicals.
Food companies, who these days are forced to label added chemicals, would like to avoid using terms like citric acid, calcium phosphate and sodium citrate on their products, but some of these greatly-decrease the risk of food poisoning. Some are not as daunting as they sound - sodium chloride and disaccharide are salt and sugar, respectively.
All additives are carefully monitored, which is more than can be said for pesticide residues. See "Chemicals, use of as flavouring materials"; "Food Additives"; "Pesticides"