It is common knowledge that processed foods are not ideal for our health. These foods often contain preservatives that are difficult to identify due to being hidden under various names. Some examples are artificial sweeteners (found in diet coke), trans fat (found in fast foods), potassium bromate (found in breads) and sodium nitrate (found in processed meat such as ham or bacon). Be sure to read the ingredients on the packaging before you purchase these food items.
All these preservatives are proven safe for consumption in the quantities present in the food product. However, if you wish to avoid the high intake of these additives, I recommend choosing food items with the least number of ingredients and additives listed and avoid the use of processed food. These foods will have the highest number of additives.