So - you've not got a cold or any similar infection but you're troubled by frequent sneezing/mucus problems like post-nasal drip or a runny nose? - Well these problems can be caused by sensitivity to salt (which can have resulted from taking prescribed meds), and if that is the case you may like to try cutting down on salt and salty food. The problems can also be caused by eating sugary food, so you could try eating less of that. Whether your problems are salty or sugary, cutting down on processed foods is likely to improve matters. And you will feel so much better!