As we cross solidly into the Fall season, some people’s allergies cease to bother them while others with indoor environmental allergies (dust, dust mites) are on the rise. Interestingly, having seasonal allergies may increase a person’s likelihood of having certain food allergies and vice versa. There are many potential cross-reactions with foods that should be considered when someone has environmental allergies. Oral allergy syndrome (OAS) is caused by cross reactivity between proteins in fresh fruits, vegetables and nuts with pollens. This syndrome occurs in a large number (up to 70 percent) of people with pollen allergy.