My 15-year-old son gets sinus symptoms when he drinks milk. He's been off milk for about 6 months now and doesn't need any of his allergy meds anymore.
One of my sons had probable food allergies as a small child. For the first 3 or 4 years he was not to eat milk, wheat or eggs. He seems to eat those things ok as an adult, but yes, he had respiratory symptoms back then.