Most people can eat any food they can buy in the store, as long as it is properly prepared.
However, some people have weakened immune systems, and they can get sick even from eating foods that are prepared in a safe manner. The government works with the food industry to reduce the risk of foodborne illness. But there are some foods that are just more 'risky' than others, particularly for certain groups of people. There are several groups of people who have weakened or undeveloped immune systems. Do not drink unpasteurized milk, or eat uncooked eggs.