Sneezing could be due to allergies. High protein in the diet could aggravate this. So, if you are not a vegan, please remove all animal products like dairy, meat, chicken, fish, eggs which are high in protein. If you are on a vegan diet, remove excess protein sources like soy nuggets and tofu etc. Do this for at least 6 months so the body has a chance to recover. Then add these products back if you wish and check. If the allergies return, then avoid these products again for another 6 months. Most people heal from allergies on a healthy, plant-based diet.