In many cases, most particularly with ketchup and other condiments, the use of preservatives was often used to disguise insanitary production practices.
The fundamental problem comes with the preservatives and anti-oxidants which give commercial lemonade its shelf life -- potassium sorbate, sodium metabisulphite, sulphur dioxide, sodium benzoate and potassium disulfite.
Most pre-sliced cold cuts are higher in fat, nitrates, and sodium than those that are sliced to order, as a larger exposed surface requires stronger preservatives.
