I don't know about carbos. They don't seem to really effect me. It could be a lack of vegetables. Vegetables have chlorophyll which I thought was just for plants making their own food but it's a natural deoderizer. I noticed when I stopped eating them I smelled a little. Magnesium, chlorophyll, and zinc is supposed to help.
For anyone who has a fecal smell then take vitamin k and biotin. I don't have this smell but I looked it up online and its for people who smell like shit. I have a bad smell coming from my scalp otherwise im pretty not smelly so I just wear a cap or bandana a lot.