Can certain processed and packaged food cause hay fever / asthma type symptoms? The answer is a big fat YES. It happened to me. Starting with a blocked nose which lasted about 2 years. At work, colleagues would ask if I had a cold (I didnβt), as I sounded so nasal all the time. It got worse at times with extreme bouts of hay fever symptoms, scratchy throat, blocked nose and irritability – I now know this was due to…