YES! Colon cleansing is the place to start. Get rid of the built up fecal matter in your lower intestines and the smells will start to dissipate (though they'll be powerful during the cleanse).
Juice fasting is also a great way to clean out the digestive system and still add super nutrients to your immune system. I use Hoodia to take away the hunger pains - wimpy maybe but it makes it much easier.
This sounds too simple to be true, but you'll be surprised. Proper input and output will get it done.