A general topic is not enough; for an argument paper, a debatable topic or argument is needed.
Food safety is good is not a debatable topic. The majority of people would like their food to be safe. It would be hard to find articles arguing that food safety is bad.
The debate lies in what we should do about food safety.
Here are some examples of arguments:
Notice that for each of these, the opposite could be argued:
That makes these arguments debatable.
Use the viewpoints essays section of Opposing Viewpoints to find examples of arguments.