WHY IS IT ONLY PLANT-BASED OTHERWISE HEALTHY FOODS THAT PEOPLE ARE ALLERGIC TO?

As the nourishment major, I mostly consternation how someone can be allergic to full of health dishes such as nuts, strawberries, as well as soy. It is usually differently full of health dishes which people have been allergic to. I’ve never listened of any one being allergic to diseased dishes similar to bacon or hamburgers. This contradicts all I mount for: which eating the full of health diet tall in plant dishes will give we the prolonged hold up as well as cut down one’s risk of cancer. So how can someone be genetically allergic to full of health foods?