Government guidelines state that there is no safe level of alcohol. When will levels of chemicals in food be investigated?

The Government announced today that there are no safe levels of alcohol consumption. It strikes me that we have been drinking wine and beer for centuries. At what point will the safe limit for chemical in our food be investigated? Surely the additives and preservatives in ready  made meals and the fast food industry is playing a big part on the stress and strain that is put on our liver and kidneys.