Hello, I had nasal polyps for 2 years now with no sense of smell or taste, got surgery with no luck. I didn't try eliminating sugar, but I don't really have a sweet tooth. My problem started when I started painting cars with no mask on somtimes, the fumes were starting to burn my nose and stayed stuck.
I started rinsing my nose with 1/4 teaspoon salt, 1/4 teaspoon baking soda, and a drop or two of Black seed oil but if more it burns, all in warm distilled water.
With God's help I started to smell and taste after two or three weeks. But now I stopped smelling and tasting because I stopped after month and a half I got lazy mixing and warming up the distilled water.
Wish you good luck.