Sometimes food can get trapped in the garbage disposal. You can put fresh lemon slices down in there and run the disposal. It will break up the food and deodorize. There are other "homemade" recipes that you can use with the same results or you can purchase disposal cleaners (I use them every few months and the homemade recipes between).
Basically you must keep your kitchen clean, you will never have any odour problem. I have recently installed Oak kitchen cabinets and as the cabinets are new they have a chemical like smell. I usually burn an incense in the morning which eliminates the smell and purify the air by giving an aromatic fragrance.