Packed Food

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Following harmfull chemicals are added to packed foods:

Food additives can be divided into several groups, although there is some overlap between them.

 

Acids Food acids are added to make flavors "sharper", and also act as preservatives and antioxidants. Common food acids include vinegar, citric acid, tartaric acid, malic acid, fumaric acid, lactic acid. Acidity regulators Acidity regulators are used to change or otherwise control the acidity and alkalinity of foods. Anticaking agents Anticaking agents keep powders such as milk powder from caking or sticking. Antifoaming agents Antifoaming agents reduce or prevent foaming in foods. Antioxidants Antioxidants such as vitamin C act as preservatives by inhibiting the effects of oxygen on food, and can be beneficial to health. Bulking agents Bulking agents such as starch are additives that increase the bulk of a food without affecting its nutritional value. Food coloring Colorings are added to food to replace colors lost during preparation, or to make food look more attractive. Color retention agents In contrast to colorings, color retention agents are used to preserve a food's existing color. Emulsifiers Emulsifiers allow water and oils to remain mixed together in an emulsion, as in mayonnaise, ice cream, and homogenized milk. Flavours Flavors are additives that give food a particular taste or smell, and may be derived from natural ingredients or created artificially. Flavour enhancers Flavor enhancers enhance a food's existing flavors. They maybe extracted from natural sources (through distillation, solvent extraction, maceration, among other methods) or created artificially. Flour treatment agents Flour treatment agents are added to flour to improve its color or its use in baking. Humectants Humectants prevent foods from drying out. Preservatives Preservatives prevent or inhibit spoilage of food due to fungi, bacteria and other microorganisms. Stabilizers Stabilizers, thickeners and gelling agents, like agar or pectin (used in jam for example) give foods a firmer texture. While they are not true emulsifiers, they help to stabilize emulsions. Sweeteners Sweeteners are added to foods for flavoring. Sweeteners other than sugar are added to keep the food energy (calories) low, or because they have beneficial effects for diabetes mellitus and tooth decay and diarrhea. Thickeners Thickeners are substances which, when added to the mixture, increase its viscosity without substantially modifying its other properties.

http://en.wikipedia.org/wiki/Food_additive

Exact details and there harmful effect can be read at:

http://en.wikipedia.org/wiki/List_of_food_additives